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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2018	May 07, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Trading Symbol	HSDT
Entity Registrant Name	HELIUS MEDICAL TECHNOLOGIES, INC.
Entity Central Index Key	0001610853
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		23,260,494

Unaudited Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash	$ 4,395	$ 5,562
Receivables	697	704
Prepaid expenses	258	352
Other current assets	105
Total current assets	5,455	6,618
Property, plant and equipment, net	190	173
Other assets	18	18
TOTAL ASSETS	5,663	6,809
Current liabilities
Accounts payable	2,573	3,479
Accrued liabilities	1,512	1,242
Derivative financial instruments	3,807	9,578
Total current liabilities	7,892	14,299
TOTAL LIABILITIES	7,892	14,299
Commitments and contingencies (Note 6)
STOCKHOLDERS’ DEFICIT
Common stock (Unlimited Class A common shares authorized); (20,797,309 shares issued and outstanding as of March 31, 2018 and 20,178,226 shares issued and outstanding as of December 31, 2017)	59,229	52,230
Additional paid-in capital	6,982	6,602
Accumulated other comprehensive income (loss)	(906)	47
Accumulated deficit	(67,534)	(66,369)
TOTAL STOCKHOLDERS’ DEFICIT	(2,229)	(7,490)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 5,663	$ 6,809

Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Common Stock, Shares Authorized	Unlimited	Unlimited
Common Stock, Shares, Issued	20,797,309	20,178,226
Common Stock, Shares, Outstanding	20,797,309	20,178,226

Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating expenses:
Research and development	$ 2,552	$ 3,028
General and administrative	2,165	2,006
Total operating expenses	4,717	5,034
Operating loss	(4,717)	(5,034)
Other income (expense):
Other income	59
Change in fair value of derivative financial instruments	2,525	(516)
Foreign exchange gain (loss)	968	(128)
Total other income (expense)	3,552	(644)
Net loss	(1,165)	(5,678)
Other comprehensive loss
Foreign currency translation adjustments	(953)	(4)
Comprehensive loss	$ (2,118)	$ (5,682)
Net loss per share
Basic	$ (0.06)	$ (0.32)
Diluted	$ (0.08)	$ (0.32)
Weighted average shares outstanding
Basic	20,334,929	17,573,966
Diluted	20,460,656	17,573,966

Unaudited Condensed Consolidated Statement of Stockholders' Deficit - 3 months ended Mar. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ (7,490)	$ 52,230	$ 6,602	$ 47	$ (66,369)
Beginning Balance, Shares at Dec. 31, 2017		20,178,226
Stock-based compensation expense	380		380
Proceeds from the exercise of stock options and warrants	3,753	$ 3,753
Proceeds from the exercise of stock options and warrants, Shares		619,083
Reclassification of liability classified warrants upon exercise	3,246	$ 3,246
Net loss	(1,165)				(1,165)
Foreign currency translation adjustments	(953)			(953)
Ending Balance at Mar. 31, 2018	$ (2,229)	$ 59,229	$ 6,982	$ (906)	$ (67,534)
Ending Balance, Shares at Mar. 31, 2018		20,797,309

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (1,165)	$ (5,678)
Adjustments to reconcile net loss to net cash used in operating activities:
Change in fair value of derivative financial instruments	(2,525)	516
Stock-based compensation expense	387	242
Unrealized foreign exchange (gain) loss	(993)	110
Depreciation expense	10	0
Changes in operating assets and liabilities:
Receivables	7	(350)
Prepaid expenses	94	86
Other assets	(105)	(18)
Accounts payable	(886)	1,605
Accrued liabilities	316	623
Net cash used in operating activities	(4,860)	(2,864)
Cash flows from investing activities
Purchase of property, plant & equipment	(27)	0
Net cash used in investing activities	(27)	0
Cash flows from financing activities:
Proceeds from the issuance of common stock	0	9,187
Share issuance costs	(73)	(1,239)
Proceeds from the exercise of stock options and warrants	3,753	28
Net cash provided by financing activities	3,680	7,976
Effect of foreign exchange rate changes on cash	40	(115)
Net (decrease) increase in cash	(1,167)	4,997
Cash at beginning of period	5,562	2,669
Cash at end of period	$ 4,395	$ 7,666

Description of Business	3 Months Ended
Description of Business	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Description of Business	1. DESCRIPTION OF BUSINESS Helius Medical Technologies, Inc. (the “Company”) is engaged primarily in the medical technology industry focused on neurological wellness. The Company’s planned principal operations include the development, licensing and acquisition of unique and non-invasive platform technologies to amplify the brain’s ability to heal itself. Many patients with brain injury or brain-related disease have disrupted neural networks that result in their brains being unable to correctly or efficiently carry neural impulses, which are responsible for directing bodily functions like movement control or sensory perception. Our first product in development, known as the portable neuromodulation stimulator or PoNS^® device, is designed to enhance the brain’s ability to compensate for this damage. Our PoNS Treatment is the combination of our PoNS device and functional, targeted physical or cognitive therapy, and is currently being developed for the treatment of movement, gait and balance disorders in patients with traumatic brain injury, or TBI, and other chronic neurological diseases. The Company was incorporated in British Columbia, Canada, on March 13, 2014. On May 28, 2014, the Company completed a continuation via a plan of arrangement whereby the Company moved from being a corporation governed by the British Columbia Corporations Act to a corporation governed by the Wyoming Business Corporations Act. The Company is based in Newtown, Pennsylvania. The Company has two wholly-owned subsidiaries, Neurohabilitation Corporation (“NHC”) and Helius Medical Technologies (Canada), Inc. (“Helius Canada”). The Company’s Class A common stock (“common stock”) is listed on the Nasdaq Capital Market (“Nasdaq”) and the Toronto Stock Exchange (the “TSX”). The Company’s Class A common stock began trading on the Canadian Securities Exchange on June 23, 2014, under the ticker symbol “HSM”, and subsequently moved to the TSX on April 18, 2016. On April 11, 2018, the Company’s Class A common stock began trading on the Nasdaq under the ticker symbol “HSDT” after having been traded on the OTCQB under the ticker symbol “HSDT” since February 10, 2015. The Company’s financial information is presented in United States Dollars. Reverse Stock Split Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its Class A Common Stock. All share and per share amounts in this Quarterly Report have been reflected on a post-split basis. Liquidity and Financial Condition The Company has not generated any product revenues and has not achieved profitable operations. The Company expects to continue to incur operating losses and net cash outflows until such time as it generates a level of revenue to support its cost structure. As of March 31, 2018, the Company had cash of $4.4 million. In April 2018, the Company issued 2,463,185 shares of its common stock and warrants to purchase 2,463,185 shares of the Company’s common stock in an underwritten public offering at a price of $7.47 per share and accompanying warrants. Net proceeds from the offering after deducting underwriting discounts and commissions was approximately $17.3 million. The Company estimates that offering expenses will be approximately $1.0 million (see Note 9). While the actual amount of cash that the Company will need to operate is subject to many factors, the Company believes that its current cash position along with the net proceeds received from the offering will be sufficient to fund its operations through the second quarter of 2019. The Company intends to fund ongoing activities by utilizing its current cash and by raising additional capital through equity or debt financings. There can be no assurance that the Company will be successful in raising that additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, the Company may be compelled to reduce the scope of its operations and planned capital expenditures.

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Use of Estimates

The preparation of the condensed consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and disclosure of contingent assets and liabilities. Significant estimates include the assumptions used in the fair value pricing model for stock-based compensation, derivative financial instruments and deferred income tax asset valuation allowance. Financial statements include estimates which, by their nature, are uncertain. Actual outcomes could differ from these estimates.

Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements reflect the operations of Helius Medical Technologies, Inc. and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. Certain prior period amounts have been reclassified to conform to current period amounts.

Concentrations of Credit Risk

The Company is subject to credit risk with respect to its cash. Amounts invested in such instruments are limited by credit rating, maturity, industry group, investment type and issuer. The Company is not currently exposed to any significant concentrations of credit risk from these financial instruments. The Company seeks to maintain safety and preservation of principal and diversification of risk, liquidity of investments sufficient to meet cash flow requirements and a competitive after-tax rate of return.

Receivables

Receivables are stated at their net realizable value. As of March 31, 2018 and December 31, 2017, receivables consisted primarily of Goods and Services Tax (“GST”) and Quebec Sales Tax (“QST”) refunds related to the Company’s expenditures.

Property, Plant and Equipment

Property, plant and equipment are carried at cost, less accumulated depreciation. Depreciation is recognized using the straight-line method over the useful lives of the related asset or the term of the related lease. Expenditures for maintenance and repairs, which do not improve or extend the expected useful life of the assets, are expensed to operations while major repairs are capitalized. The Company’s property, plant and equipment is comprised of leasehold improvements, software and hardware. The estimated useful life of its leasehold improvement is over the term of its lease of 5 years, while software and hardware has an estimated useful life of 3 to 5 years.

The following tables summarizes the Company property, plant and equipment as of March 31, 2018 and December 31, 2017 (amounts in thousands).

	As of March 31, 2018			As of December 31, 2017
Leasehold improvement	$	173		$	173
Software and hardware		44			17
		217			190
Less accumulated depreciation		(27	)		(17	)
Total	$	190		$	173

Share-Based Payments

The Company accounts for all share-based payments and awards under the fair value-based method. The Company recognizes its stock-based compensation expense using the straight-line method.

The Company accounts for the granting of stock options to employees using the fair value method whereby all awards to employees are measured at fair value on the date of the grant. The fair value of all employee-related stock options is expensed over the requisite service period with a corresponding increase to additional paid-in capital. Upon exercise of stock options, the consideration paid by the option holder, together with the amount previously recognized in additional paid-in capital is recorded as an increase to share capital. Stock options granted to employees are accounted for as liabilities when they contain conditions or other features that are indexed to other than a market, performance or service conditions.

Share-based payment to non-employees are measured at the fair value of the consideration received, or the fair value of the equity instruments issued, or liabilities incurred, whichever is more reliably measurable. The fair value of stock-based payments to non-employees are re-measured at each reporting period until the counterparty performance is complete, and any change therein is recognized over the vesting period of the award and in the same manner as if the Company had paid cash instead of paying with or using equity-based instruments. The fair value of the stock-based payments to non-employees that are fully vested and non-forfeitable as of the grant date are measured and recognized at that date.

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock options. The use of the Black-Scholes option pricing model requires management to make assumptions with respect to the expected term of the option, the expected volatility of the common stock consistent with the expected term of the option, risk-free interest rates, the value of the common stock and expected dividend yield of the common stock. Changes in these assumptions can materially affect the fair value estimate.

Foreign Currency

The functional currency of the Company and Helius Canada is the Canadian dollar (“CAD”) and the functional currency of NHC is the U.S. dollar (“USD”). The Company’s reporting currency is the U.S. dollar. Transactions in foreign currencies are recorded into the functional currency of the relevant subsidiary at the exchange rate in effect at the date of the transaction. Any monetary assets and liabilities arising from these transactions are translated into the functional currency at exchange rates in effect at the balance sheet date or on settlement. Revenues, expenses and cash flows are translated at the weighted-average rates of exchanges for the reporting period. The resulting currency translation adjustments are not included in the Company’s condensed consolidated statements of operations for the reporting period, but rather are accumulated and gains and losses are recorded in foreign exchange gain (loss) within the condensed consolidated statements of operations and comprehensive loss. The foreign exchange adjustment in the books of NHC relating to intercompany advances from Helius that are denominated in Canadian dollars is recorded in the condensed consolidated statements of operations.

Income Taxes

The Company accounts for income taxes using the asset and liability method. The asset and liability method provide that deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial reporting and tax bases of assets and liabilities, and for operating loss and tax credit carry-forwards. Deferred tax assets and liabilities are measured using the currently enacted tax rates and laws that will be in effect when the differences are expected to reverse. The Company records a valuation allowance to reduce deferred tax assets to the amount that is believed more likely than not to be realized.

The Company has adopted the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 740 Income Taxes regarding accounting for uncertainty in income taxes. The Company initially recognizes tax positions in the financial statements when it is more likely than not the position will be sustained upon examination by the tax authorities. Such tax positions are initially and subsequently measured as the largest amount of the tax benefit that is greater than 50% likely of being realized upon ultimate settlement with the tax authority, assuming full knowledge of the position and all relevant facts. Application requires numerous estimates based on available information. The Company considers many factors when evaluating and estimating its tax positions and tax benefits. These periodic adjustments may have a material impact on the consolidated statements of operations and comprehensive loss. When applicable, the Company classifies penalties and interest associated with uncertain tax positions as a component of income tax expense in its condensed consolidated statements of operations and comprehensive loss.

Research and Development Expenses

Research and development (“R&D”) expenses consist primarily of personnel costs, including salaries, benefits and stock-based compensation, clinical studies performed by contract research organizations, development and manufacturing of clinical trial devices and devices for manufacturing testing and materials and supplies. R&D costs are charged to operations when they are incurred.

Segment Information

Operating segments are defined as components of an enterprise about which separate discrete information is available for evaluation by the chief operating decision maker, or decision-making group, in deciding how to allocate resources and in assessing performance. The Company operates and manages its business within one operating and reportable segment. Accordingly, the Company reports the accompanying consolidated financial statements in the aggregate in one reportable segment.

Derivative Financial Instruments

The Company evaluates its financial instruments and other contracts to determine if those contracts or embedded components of those contracts qualify as derivatives to be separately accounted for in accordance with ASC 815, Derivatives and Hedging. The result of this accounting treatment is that the fair value of the derivative is marked-to-market at each balance sheet date and recorded as a liability or asset and the change in fair value is recorded in the consolidated statements of operations and comprehensive loss. The Company’s derivative financial instruments are comprised of warrants and non-employee stock options. Upon settlement of a derivative financial instrument, the instrument is marked to fair value at the settlement date and the fair value of the underlying instrument is reclassified to equity.

The classification of derivative financial instruments, including whether such instruments should be recorded as liabilities/assets or as equity, is reassessed at the end of each reporting period. Derivative financial instruments that become subject to reclassification are reclassified at the fair value of the instrument on the reclassification date. Derivative financial instruments will be classified in the condensed consolidated balance sheet as current if the right to exercise or settle the derivative financial instrument lies with the holder.

Fair Value Measurements

The Company accounts for financial instruments in accordance with ASC 820, Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 820 are described below:

Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 – Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

The Company’s financial instruments recorded in its condensed consolidated balance sheets consist primarily of cash, receivables, accounts payable, accrued liabilities, and derivative financial instruments. The book values of these instruments, with the exception of derivative financial instruments, approximate their fair values due to the immediate or short-term nature of these instruments.

The Company’s derivative financial instruments are classified as Level 3 within the fair value hierarchy and required to be recorded at fair value on a recurring basis. Unobservable inputs used in the valuation of these financial instruments include volatility of the underlying share price and the expected term. See Note 3 for the inputs used in the Black-Scholes option-pricing model as of March 31, 2018 and 2017 and the roll forward of the derivative financial instruments related to the warrants. See Note 4 for the inputs used in the Black-Scholes option-pricing model as of March 31, 2018 for the roll forward of the derivative financial instruments related to the non-employee stock options.

The following table summarizes the Company’s derivative financial instruments within the fair value hierarchy as of March 31, 2018 and December 31, 2017 (amounts in thousands):

	Fair Value		Level 1		Level 2		Level 3
March 31, 2018
Liabilities:
Non-employee options	$	1,329		—		—	$	1,329
Warrants		2,478		—		—		2,478
December 31, 2017
Liabilities:
Non-employee options	$	2,637		—		—	$	2,637
Warrants		6,941		—		—		6,941

There were no transfers between any levels for any of the periods presented.

Basic and Diluted Income (Loss) per Share

Earnings or loss per share (“EPS”) is computed by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted EPS is computed by dividing net income (loss) by the weighted average of all potentially dilutive shares of common stock that were outstanding during the periods presented.

The treasury stock method is used in calculating diluted EPS for potentially dilutive stock options and share purchase warrants, which assumes that any proceeds received from the exercise of in-the-money stock options and warrants, would be used to purchase common shares at the average market price for the period.

The basic and diluted loss per share for the periods noted below is as follows (amounts in thousands except shares and per share data):

	Three Months Ended
	March 31,
	2018			2017
Basic
Numerator:
Net loss	$	(1,165	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Basic net loss per share	$	(0.06	)	$	(0.32	)

Diluted
Numerator:
Net loss, basic	$	(1,165	)	$	(5,678	)
Effect of dilutive securities: Change in fair value of derivative financial instruments		(434	)		—
Net loss, diluted	$	(1,599	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Potential common share issuances:
Incremental dilutive shares from stock options and warrants (treasury stock method)		125,727			—
Weighted average common shares outstanding - diluted		20,460,656			17,573,966
Diluted net loss per share	$	(0.08	)	$	(0.32	)

During the three months ended March 31, 2018, a total of 2,208,646 options and 1,818,439 warrants were excluded from the calculation of diluted loss per share as their effect would have been anti-dilutive. During the three months ended March 31, 2017, a total of 1,957,000 options and 2,017,152 warrants were excluded from the calculation of diluted loss per share as their effect would have been anti-dilutive.

Recent Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard establishes a right-of-use, or ROU, model that requires a lessee to record a ROU asset and a lease liability on the consolidated balance sheet for all leases with terms longer than 12 months. Leases will be classified as either finance or operating, with classification affecting the pattern of expense recognition in the consolidated statement of operations. ASU 2016-02 is effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods, with early adoption permitted. A modified retrospective transition approach is required for lessees for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the condensed consolidated financial statements, with certain practical expedients available. We are currently evaluating the potential impact of the standard on our condensed consolidated financial statements.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), which was further amended through various updates issued by the FASB thereafter. The amendments of Topic 606 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five-step model to be applied by an entity in evaluating its contracts with customers. The Company does not have any revenues or contracts with customers and will need to evaluate the impact of Topic 606 on its results of operations, cash flows and financial position should a revenue generating transaction arise in the future. The Company adopted Topic 606 on January 1, 2018 on a modified retrospective basis, and the adoption had no impact on the Company’s condensed consolidated financial statements.

Common Stock and Warrants

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Common Stock and Warrants

3. COMMON STOCK AND WARRANTS

As of March 31, 2018, the Company’s certificate of incorporation authorized the Company to issue unlimited Class A common shares without par value. Each Class A common share is entitled to have the right to vote at any shareholder meeting on the basis of one vote per share. Each Class A share held entitles the holder to receive dividends as declared by the directors. No dividends have been declared through March 31, 2018. In the event of a liquidation, dissolution or winding-up of the Company other distribution of assets of the Company among its shareholders for the purposes of winding-up its affairs or upon a reduction of capital the holders of the Class A common shares shall, share equally, share for share, in the remaining assets and property of the Company.

The Company is subject to a stockholders’ agreement, which places certain restrictions on the Company’s stock and its stockholders. These restrictions include approvals prior to sale or transfer of stock, a right of first refusal to purchase stock held by the Company and a secondary right of refusal to stockholders, right of co-sale whereby certain stockholders may be enabled to participate in a sale of other stockholders to obtain the same price, term and conditions on a pro-rata basis, rights of first offer of new security issuances to current stockholders on a pro-rata basis and certain other restrictions.

On October 9, 2015, the Company entered into a $7.0 million funding commitment with A&B (HK) Company Limited (“A&B”), in the form of a convertible promissory note consisting of an initial $2.0 million note and a $5.0 million funding commitment. On October 9, 2015, the Company received the conversion notice on the promissory note and in November 2015, the Company issued 416,666 shares of common stock at a price of $4.80 per share and 208,333 warrants exercisable at $7.20 for a period of three years from the date of issuance. The shares of common stock and the warrants were issued on November 10, 2015. On December 29, 2015, the Company drew down the $5.0 million funding commitment through the issuance of 1,111,111 shares of common stock at a price of $4.50 per share and 555,556 warrants exercisable at $6.75 for a period of three years from the date of issuance. The shares of common stock and the warrants were issued on January 7, 2016. In November 2017, A&B exercised 208,333 warrants at a price of $7.20 and the Company received gross cash proceeds of $1.5 million upon the exercise. During the first quarter of 2018, A&B exercised its remaining 555,556 warrants at a price of $6.75 and the Company received gross cash proceeds of $3.8 million.

On April 18, 2016, the Company closed its short form prospectus offering in Canada and a concurrent U.S. private placement (the “April 2016 Offering”) of units (the “Units”) with gross proceeds to the Company of $7.2 million through the issuance of Units at a price of CAD$5.00 per Unit. Each Unit consists of one Class A common share in the capital of the Company (a “Common Share’) and one half of one Common Share purchase warrant (each whole warrant, a “Warrant”). Each warrant entitles the holder thereof to acquire one additional Common Share at an exercise price of CAD$7.50 on or before April 18, 2019. Mackie Research Capital Corporation (the “Agent”) acted as agent and sole bookrunner in connection with the April 2016 Offering. The Company paid the Agent a cash commission of $0.3 million and has granted to the Agent compensation options exercisable to purchase 87,210 Units at an exercise price of CAD$5.00 per Unit for a period of 24 months from the closing of the April 2016 Offering. The Company incurred other cash issuance costs of $1.1 million related to this offering.

On May 2, 2016, the Company closed the sale of the additional units issued pursuant to the exercise of the over-allotment option granted to the Agent in connection with the April 2016 Offering. The April 2016 Offering was made pursuant to a short form prospectus filed with the securities regulatory authorities in each of the provinces of Canada, except Québec. Pursuant to the exercise of the over-allotment option, the Company issued an additional 218,025 units at a price of CAD $5.00 per unit for additional gross proceeds to the Company of $0.9 million, bringing the total aggregate gross proceeds to the Company under the Offering to $8.1 million. Each over-allotment unit consisted of one Class A common share in the capital of the Company and one half of one Common Share purchase warrant. Each over-allotment warrant entitles the holder thereof to acquire one additional over-allotment Common Share at an exercise price of CAD $7.50 on or before April 18, 2019. In connection with the closing of the over-allotment option, the Company paid the Agent a cash commission of $0.1 million and granted to the Agent compensation options exercisable to purchase 13,081 over-allotment units at an exercise price of CAD $5.00 per unit for a period of 24 months from the closing of this Offering.

The warrants issued in each of the April 18, 2016 and May 2, 2016 closings are classified within equity. The proceeds from the Offering were allocated on a relative fair value basis between the Class A common shares and the warrants issued. The compensation options are accounted for as warrants. These warrants represent additional share issuance costs and are recorded within shareholders’ deficit in the Company’s condensed consolidated balance sheets at their fair value.

The fair value of the warrants granted in such offering was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:


Stock price	CAD $5.45
Exercise price	CAD $7.50
Warrant term	3.0 years
Expected volatility		83.83	%
Risk-free interest rate		0.60	%
Dividend rate		0.00	%

The fair value of the compensation options granted during such offering was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:


Stock price	CAD $6.80
Exercise price	CAD $5.00
Option term	2.0 years
Expected volatility		126.76	%
Risk-free interest rate		0.61	%
Dividend rate		0.00	%

On February 16, 2017, the Company completed an underwritten registered public offering and issued an aggregate of 1,311,000 shares of common stock for gross proceeds of $9.2 million. The Company incurred share issuance costs of $1.2 million in connection with this offering.

On June 28, 2017, the Company completed a non-brokered private placement of 800,000 shares of common stock for gross proceeds of $5.4 million. The Company incurred approximately $9 thousand in share issuance cost related to the private placement.

In December 2017, the Company completed a three-tranche non-brokered private placement (the “December 2017 financing”) of 646,016 units for gross proceeds of approximately $6.3 million. Each unit consisted of one share of Class A common stock of the Company at a price of $9.80 per share, and one share purchase warrant. Each warrant entitles the holder to acquire one additional share of Class A common stock of the Company, exercisable for a period of 36 months following the closing of the private placement at an exercise price of USD$12.25 per warrant share. The first tranche, which closed on December 22, 2017, was for 270,915 units for which the Company received gross proceeds of approximately $2.6 million. The second tranche which closed on December 28, 2017, was for 171,020 units for which the Company received approximately $1.7 million, while the third tranche which closed on December 29, 2017, was for 204,081 units for which the Company received $2.0 million. The Company paid $0.1 million in share issuance costs related to the December 2017 financing.

The fair value of the warrants granted in the December 2017 financing were estimated using the Black-Scholes option pricing model with the following weighted average assumptions

	December 22, 2017			December 28, 2017			December 29, 2017
Stock price	$	10.60		$	12.45		$	12.32
Exercise price	$	12.25		$	12.25		$	12.25
Warrant term	3.0 years			3.0 years			3.0 years
Expected volatility		60.24	%		60.24	%		60.24	%
Risk-free interest rate		2.01	%		2.00	%		1.98	%
Dividend rate		0.00	%		0.00	%		0.00	%

Pursuant to the guidance of ASC 815 Derivatives and Hedging, the Company determined that certain of its warrants issued and outstanding should be accounted for as liabilities because they are not considered to be indexed to the Company’s stock due to the exercise price being denominated in a currency other than the Company’s functional currency. Consequently, the Company determined the fair value of each warrant issuance using the Black-Scholes option pricing model, with the remainder of the proceeds allocated to the common shares.

The following table summarizes warrants that the Company accounts for as liabilities for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
Fair value of warrants at beginning of period	$	6,941		$	2,857
Exercise of warrants		(2,509	)		—
Change in fair value of warrants during the period		(1,954	)		354
Fair value of warrants at end of period	$	2,478		$	3,211

The warrants are required to be re-valued at the end of each reporting period, with the change in fair value of the liability recorded as a gain or loss in the change of fair value of derivative financial instruments, included in other income (expense) in the Company’s consolidated statements of operations and comprehensive loss. The fair value of the warrants will continue to be classified as a liability until such time as they are exercised, expire or there is an amendment to the respective agreements that renders these financial instruments to be no longer classified as a liability.

The fair value of warrants outstanding as of March 31, 2018 and 2017 were estimated using the Black-Scholes option-pricing model with the following weighted average assumptions:

	March 31, 2018			March 31, 2017
Stock price	$	10.11		$	7.80
Exercise price	$	12.72		$	8.10
Warrant term	2.29 years			1.65 years
Expected volatility		63.77	%		94.21	%
Risk-free interest rate		2.26	%		0.75	%
Dividend rate		0.00	%		0.00	%

The following is a summary of warrant activity during the three months ended March 31, 2018:

	Number of Warrants						Weighted Average Exercise Price
	CAD			US			CAD$		US$
Outstanding as of December 31, 2017		1,011,505			1,343,404		$	7.38	$	10.25
Granted		206			—			7.50		—
Exercised		(618	)		(555,556	)		5.83		6.75
Outstanding as of March 31, 2018		1,011,093			787,848		$	7.38	$	12.72

The warrants outstanding and exercisable as of March 31, 2018 were as follows:

Number of Warrants Outstanding		Exercise Price	Expiration Date
	90,406	US$15.00	April 30, 2018
	33,546	US$15.00	June 26, 2018
	3,795	US$10.75	June 26, 2020
	12,576	US$15.00	July 17, 2018
	1,509	US$10.75	July 17, 2020
	961,489	CAD$7.50	April 18, 2019
	49,604	CAD$5.00	April 18, 2018
	270,915	US$12.25	December 22, 2020
	171,020	US$12.25	December 28, 2020
	204,081	US$12.25	December 29, 2020
	1,798,941

Share Based Payments

3 Months Ended

Mar. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share Based Payments

4. SHARE BASED PAYMENTS

On June 18, 2014, the Company’s Board of Directors authorized and approved the adoption of the 2014 Stock Incentive Plan (“2014 Plan”), under which an aggregate of 2,421,603 shares of common stock may be issued. Pursuant to the terms of the 2014 Plan, the Company is authorized to grant stock options, as well as awards of stock appreciation rights, restricted stock, unrestricted shares, restricted stock units and deferred stock units. These awards may be granted to directors, officers, employees and eligible consultants. Vesting and the term of an option is determined at the discretion of the Company’s Board of Directors. On August 22, 2017, the Company’s Board of Directors approved the amended and restated 2014 Plan to correct for a formulaic error included in the deemed net stock and cashless exercise equation within the 2014 Plan. This amendment had no impact on the Company’s consolidated financial statements.

On August 8, 2016, the Company’s Board of Directors authorized and approved the adoption of the 2016 Omnibus Incentive Plan (“2016 Plan” and, together with the 2014 Plan, the “Plans”), under which an aggregate of 3,000,000 shares of common stock may be issued. Pursuant to the terms of the 2016 Plan, the Company is authorized to grant stock options, as well as awards of stock appreciation rights, restricted stock, unrestricted shares, restricted stock units, stock equivalent units and performance-based cash awards. These awards may be granted to directors, officers, employees and eligible consultants. Vesting and the term of an option is determined at the discretion of the Company’s Board of Directors.

As of March 31, 2018, there were an aggregate of 2,733,614 shares of common stock remaining available for grant under its Plans.

For the three months ended March 31, 2018 and 2017, the Company did not issue any stock options t employees, directors or non-employees.

The following is a summary of stock option activity during the three months ended March 31, 2018:

				Weighted
				Average		Aggregate
	Number			Exercise Price		Intrinsic Value
	of Options			(CAD$)		(CAD$ in '000s)
Outstanding as of December 31, 2017		2,448,646		$	7.35	$	21,089
Exercised⁽¹⁾		(80,000	)		3.00	560
Outstanding as of March 31, 2018		2,368,646		$	7.50	$	13,119
Exercisable as of March 31, 2018		1,371,739		$	5.85	$	9,934

(1) For the three months ended March 31, 2018, 80,000 stock options were exercised on a cashless basis resulting in 17,091 common shares being withheld.

The Company has adopted the simplified method prescribed by the SEC in SAB Topic 14 with respect to estimating the expected term of a stock option as its limited share purchase option history does not provide a reasonable basis to estimate the expected term. Expected volatility is determined by reference to the average volatility rates of other companies in the same industry due to the Company’s limited trading history. The aggregate intrinsic value of stock options exercised during the three months ended March 31, 2018 and 2017, was $0.6 million and $0.1 million, respectively.

The following table summarizes stock options outstanding and exercisable by employees and directors as of March 31, 2018:

			Options
			Outstanding
Number of			Remaining						Number of
Options			Contractual Life		Exercise		Grant Date Fair		Options
Outstanding		Expiration Date	(In Years)		Price (CAD)		Value (CAD)		Exercisable
	360,000	June 18, 2019		1.22	$	3.00	$	1.00		360,000
	80,000	June 18, 2019		1.22	$	3.00	$	1.32		80,000
	20,000	December 8, 2019		1.69	$	14.60	$	6.55		20,000
	80,000	December 8, 2019		1.69	$	14.80	$	6.46		80,000
	20,000	March 16, 2020		1.96	$	16.00	$	7.09		20,000
	8,500	August 14, 2020		2.38	$	4.90	$	1.94		8,500
	150,000	October 21, 2020		2.56	$	4.20	$	1.80		112,500
	20,000	December 31, 2020		2.76	$	6.20	$	2.49		20,000
	595,000	July 13, 2020		2.29	$	6.95	$	3.23		396,666
	20,000	August 8, 2020		2.36	$	6.55	$	3.23		10,000
	617,000	April 17, 2027		9.05	$	10.80	$	7.76		-
	6,146	May 18, 2027		9.14	$	10.00	$	5.23		3,073
	10,000	May 18, 2027		9.14	$	10.00	$	7.63		-
	30,000	August 8, 2027		9.36	$	13.15	$	8.86		-
	2,016,646									1,110,739

As of March 31, 2018 and 2017, the unrecognized compensation cost related to non-vested stock options outstanding for employees and directors, was $3.3 million and $1.0 million, respectively, to be recognized over a weighted-average remaining vesting period of approximately 2.3 years and 1.2 years, respectively. The Company recognizes compensation expense for only the portion of awards that are expected to vest.

During the fourth quarter of 2017, upon a review of the Company’s equity compensation awards granted under the 2016 Plan it determined that it had inadvertently exceeded the annual per-person sub-limits involving certain awards previously made to a current executive officer. The aggregate amount of common stock represented by this excess award, which consisted of stock options, was 60,000 shares. This excess award was deemed to have been granted outside of the 2016 Plan and as such the Company applied liability accounting to the awards. As a result, this excess award is being remeasured at each reporting period until such time that the Company’s shareholders approve the excess award at which time the liability will be reclassified to additional paid-in capital. The unrecognized fair value calculated for the excess award as of the date of shareholders’ approval will be recognized as compensation expense ratably over the remaining requisite service period for the excess award.

Non-Employee Stock Options

The following table summarizes stock options outstanding and exercisable by non-employees as of March 31, 2018:

			Options
			Outstanding
Number of			Remaining						Number of
Options			Contractual Life		Exercise		Grant Date Fair		Options
Outstanding		Expiration Date	(In Years)		Price (CAD)		Value (CAD)		Exercisable
	80,000	June 18, 2019		1.22	$	3.00	$	1.32		80,000
	30,000	December 8, 2019		1.69	$	14.60	$	8.25		30,000
	82,000	October 3, 2020		2.76	$	6.75	$	4.00		41,000
	110,000	October 28, 2020		2.51	$	4.20	$	2.20		110,000
	20,000	May 18, 2027		9.14	$	10.00	$	8.69		-
	15,000	August 8, 2027		9.36	$	13.15	$	11.70		-
	15,000	November 6, 2027		9.61	$	20.65	$	19.93		-
	352,000									261,000

As of March 31, 2018, the unrecognized compensation cost related to non-vested stock options outstanding for non-employees, was $0.2 million to be recognized over a weighted-average remaining vesting period of approximately 1.1 years. The Company had no unrecognized compensation cost related to non-vested stock options for non-employees as of March 31, 2017. The Company recognizes compensation expense for only the portion of awards that are expected to vest.

In accordance with the guidance of ASC 815-40-15, stock options awarded to non-employees that are performing services for NHC are required to be accounted for as derivative financial instruments once the services have been performed and the options have vested because they are considered not to be indexed to the Company’s stock due to their exercise price being denominated in a currency other than NHC’s functional currency. Stock options awarded to non-employees that have not vested are re-measured at their respective fair values at each reporting period and accounted for as equity awards until the terms associated with their vesting requirements have been met. The changes in fair value of the unvested non-employee awards are reflected in their respective operating expense classification in the Company’s condensed consolidated statements of operations and comprehensive loss.

The non-employee stock options that are required to be accounted for as liabilities are summarized as follows (amounts in thousands):

	Three Months Ended March 31,
	2018			2017
Fair value of non-employee options at beginning of period	$	2,637		$	1,617
Exercise of non-employee options		(737	)		—
Change in fair value of non-employee stock options during the period		(571	)		162
Fair value of non-employee options at end of period	$	1,329		$	1,779

The non-employee stock options that have vested are required to be re-valued with the change in fair value recorded as a gain or loss in the change of fair value of derivative financial instruments and included in other income (expense) in the Company’s condensed consolidated statements of operations and comprehensive loss at the end of each reporting period. The fair value of the stock options will continue to be classified as a derivative financial instrument until such time as they are exercised, expire or there is an amendment to the respective agreements that renders these financial instruments to be no longer classified as such.

The fair value of non-employee liability classified awards as of March 31, 2018 and 2017 was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:

	March 31, 2018			March 31, 2017
Stock price	CAD $12.87			CAD $10.50
Exercise price	CAD $4.83			CAD $6.15
Expected term	1.29 years			2.35 years
Expected volatility		67.92	%		85.39	%
Risk-free interest rate		1.60	%		0.81	%
Dividend rate		0.00	%		0.00	%

Restricted Stock Units

During the second quarter of 2017, the Company granted restricted stock units (“RSUs”) to certain employees under the 2016 Plan that vest over a three-year period, with 25% vesting immediately. The fair value of the restricted stock units was based on the closing price of the Company’s common stock on the date of grant. For the three months ended March 31, 2018, the Company had 4,915 RSUs outstanding with a weighted average grant date fair value of CAD$10.00 and 2,987 RSUs that had vested. The Company did not issue, and there were no exercises or forfeitures of RSUs for the three months ended March 31, 2018.

Stock-based compensation expense is classified in the Company’s condensed consolidated statements of operations and comprehensive loss as follows (amounts in thousands):

	Three Months Ended March 31,
	2018		2017
Research and development	$	99	$	25
General and administrative		288		217
Total	$	387	$	242

Accrued Expenses

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Accrued Expenses

5.	ACCRUED EXPENSES

Accrued expenses consisted of the following (amounts in thousands):

	March 31, 2018		December 31, 2017
Employee benefits	$	530	$	442
Legal expense		388		343
Professional services		256		88
Advance from U.S Army		233		233
Deferred rent		104		97
Severance		-		38
Other		1		1
	$	1,512	$	1,242

Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

6. COMMITMENTS AND CONTINGENCIES

(a)

On January 22, 2013, the Company entered into a license agreement with Advanced NeuroRehabilitation, LLC (“ANR”) for an exclusive right on ANR’s patent pending technology, claims and knowhow. In addition to the issuance of 3,207,005 shares of common stock, the Company agreed to pay a 4% royalty on net revenue on the sales of devices covered by the patent-pending technology and services related to the therapy or use of devices covered by the patent-pending technology. The Company has not made any royalty payments to date under this agreement.

(b)

On October 30, 2017, NHC amended the Asset Purchase Agreement with A&B which specified that if the Company fails to obtain FDA marketing authorization for commercialization of or otherwise fails to ensure that the PoNS device is available for purchase by the U.S. Government by December 31, 2021, the Company would be subject to a $2.0 million contract penalty payable to A&B, unless the Company receives an exemption for the requirement of FDA marketing authorization from the US Army Medical Material Agency. Based on this amendment the Company has determined that the possibility of a payment under this contractual penalty is remote.

(c)

In November 2014, the Company signed a development and distribution agreement with Altair LLC to apply for registration and distribution of the PoNS device in the territories of the former Soviet Union. The Company will receive 7% royalty on sales of the devices within the territories. However, there is no assurance that such commercialization will occur.

(d)

In March 2017, the Company entered into a lease for office space in Newtown, Pennsylvania. The initial term of the lease is from July 1, 2017 through December 31, 2022, with an option to extend until 2027. In July 2017, the Company amended the contract to commence the lease on July 17, 2017 through January 16, 2023, with an option to extend until January 2028. Monthly rent plus utilities will be approximately $20,000 per month beginning in January 2018 with a 3% annual increase.

The future minimum lease payments related to the Company’s non-cancellable operating lease commitments were as follows (amounts in thousands):

For the Year Ending December 31,
2018 (remaining 9 months)	$	174
2019		246
2020		253
2021		260
2022		267
Thereafter		12
	$	1,212

(e)

On December 29, 2017, NHC, a wholly owned subsidiary of the Company entered into a Manufacturing and Supply Agreement (“MSA”) with Key Tronic Corporation (“Key Tronic”), for the manufacture and supply of the Company’s PoNS device based upon the Company’s product specifications as set forth in the MSA. Per the agreement, the Company shall provide to Key Tronic a rolling forecast for the procurement of parts and material and within normal lead times based on estimated delivery dates for the manufacture of the PoNS device. The term of the agreement will be for three-years and will automatically renew for additional consecutive terms of one year, unless cancelled by either party upon 180-day written notice to the other party prior to the end of the then current term. As of March 31, 2018, no initial forecast had been provided to Key Tronic by the Company.

Related Party Transactions

3 Months Ended

Mar. 31, 2018

Related Party Transactions

7. RELATED PARTY TRANSACTIONS

During the three months ended March 31, 2018 and 2017, the Company paid $3 thousand and $18 thousand in consulting fees to certain directors of the Company, respectively.

In April 2016, the Company entered into a consulting agreement with Montel Media, Inc. (“Montel Media”), pursuant to which Montel Media provides consulting services for the promotion of the Company’s clinical trials and ongoing media and marketing strategies. Under the agreement, Montel Media received $15,000 per month. The Company paid Montel Media $45 thousand each during the three months ended March 31, 2018 and 2017 towards the consulting agreement. During the first quarter of 2018, the Company terminated its agreement with Montel Media. Montel Media is owned by Montel Williams, who beneficially owns greater than 5% of the Company’s common stock.

For the three months ended March 31, 2018 and 2017, a benefit of $0.2 million and an expense of $48 thousand was included in the change in fair value of derivative financial instruments as the fair value of stock-based compensation attributed to the options granted to a director for consulting services rendered with respect to the design and development of the PoNS device.

The Company’s Chief Medical Officer is a founding member of Clinvue LLC, (“Clinvue”), a company that provides regulatory advisory services for the Company. For the three months ended March 31, 2018, the Company paid Clinvue approximately $0.1 million for consulting services. The Company made no payment to Clinvue for the three months ended March 31, 2017.

In connection with the December 2017 private placement, the Company’s Chief Executive Officer, its Chief Financial Officer/Chief Operating Officer, two directors and A&B, a greater than 5% owner of the Company’s shares outstanding subscribed in the private placement.

The following table summarizes their participation (subscription amounts in thousands):

	Units Purchased		Subscription Amount
A&B (HK) Company Ltd.		204,081	$	2,000
Director 1		76,530		750
Director 2		51,019		500
CEO		25,510		250
CFO/COO		15,816		155
		372,956	$	3,655

Sole-Source Cost-Sharing Agreement	3 Months Ended
Sole-Source Cost-Sharing Agreement	Mar. 31, 2018
Disclosure Of Cost Sharing Agreement [Abstract]
Sole-Source Cost-Sharing Agreement	8. SOLE-SOURCE COST-SHARING AGREEMENT In July 2015, the Company entered into a sole source cost sharing agreement with the U.S. Army Medical Research and Materiel Command (“USAMRMC”). Under the terms of the contract, the USAMRMC will reimburse the Company up to a maximum of $3.0 million to conduct a registrational trial investigating the safety and effectiveness of the PoNS device for the treatment of chronic balance deficits due to mild to moderate traumatic brain injury. Reimbursement of expenses under the agreement is based on a schedule of milestones related to the completion of subjects in the trial. The original contract expired on December 31, 2016; however, the Company extended the contract agreement through December 31, 2017. On November 7, 2017, the Company received another extension of the contract agreement to December 31, 2018. As of March 31, 2018, the Company has received a total of $3.0 million with respect to expenses reimbursed for amounts owed to the Company for completion of development milestones, of which $0.2 million of the total received has been recorded as an advance against the fifth and final milestone. All reimbursement amounts received are credited directly to the accounts in which the original expense is recorded, including research and development, wages and salaries, and legal expenses. In addition, during the third quarter of 2017, the Company announced the execution of an extension to its Cooperative Research and Development Agreement (“CRADA”) with the USAMRMC through 2018 and extended the deadline for commercialization of the PoNS device to December 31, 2021.

Subsequent Events	3 Months Ended
Subsequent Events	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	9. SUBSEQUENT EVENTS In April 2018, the Company issued 2,463,185 shares of its common stock and warrants to purchase 2,463,185 shares of the Company’s common stock in an underwritten public offering at a price of $7.47 per share and accompanying warrants. Net proceeds from the offering after deducting underwriting discounts and commissions was approximately $17.3 million. The Company estimates that offering expenses will be approximately $1.0 million. The Company intends to use the net proceeds from this offering primarily to fund its manufacturing activities for the PoNS device, activities related to its submissions for marketing authorization of the PoNS device to the FDA and other regulatory authorities, commercial launch preparations, and for working capital and general corporate purposes.

Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Reverse Stock Split

Effective after the close of business on January 22, 2018, the Company completed a 1-for-5 reverse stock split of its Class A Common Stock. All share and per share amounts in this Quarterly Report have been reflected on a post-split basis.

Liquidity and Financial Condition

The Company has not generated any product revenues and has not achieved profitable operations. The Company expects to continue to incur operating losses and net cash outflows until such time as it generates a level of revenue to support its cost structure.

As of March 31, 2018, the Company had cash of $4.4 million. In April 2018, the Company issued 2,463,185 shares of its common stock and warrants to purchase 2,463,185 shares of the Company’s common stock in an underwritten public offering at a price of $7.47 per share and accompanying warrants. Net proceeds from the offering after deducting underwriting discounts and commissions was approximately $17.3 million. The Company estimates that offering expenses will be approximately $1.0 million (see Note 9). While the actual amount of cash that the Company will need to operate is subject to many factors, the Company believes that its current cash position along with the net proceeds received from the offering will be sufficient to fund its operations through the second quarter of 2019.

The Company intends to fund ongoing activities by utilizing its current cash and by raising additional capital through equity or debt financings. There can be no assurance that the Company will be successful in raising that additional capital or that such capital, if available, will be on terms that are acceptable to the Company. If the Company is unable to raise sufficient additional capital, the Company may be compelled to reduce the scope of its operations and planned capital expenditures.

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Use of Estimates

Principles of Consolidation

Concentrations of Credit Risk

Receivables

Property, Plant and Equipment

The following tables summarizes the Company property, plant and equipment as of March 31, 2018 and December 31, 2017 (amounts in thousands).

	As of March 31, 2018			As of December 31, 2017
Leasehold improvement	$	173		$	173
Software and hardware		44			17
		217			190
Less accumulated depreciation		(27	)		(17	)
Total	$	190		$	173

Stock-Based Compensation

Share-Based Payments

The Company accounts for all share-based payments and awards under the fair value-based method. The Company recognizes its stock-based compensation expense using the straight-line method.

Foreign Currency

Income Taxes

Research and Development Expenses

Segment Information

Derivative Financial Instruments

Fair Value Measurements

Level 1 – Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2 – Quoted prices in markets that are not active or financial instruments for which all significant inputs are observable, either directly or indirectly; and

Level 3 – Prices or valuations that require inputs that are both significant to the fair value measurement and unobservable.

The following table summarizes the Company’s derivative financial instruments within the fair value hierarchy as of March 31, 2018 and December 31, 2017 (amounts in thousands):

	Fair Value		Level 1		Level 2		Level 3
March 31, 2018
Liabilities:
Non-employee options	$	1,329		—		—	$	1,329
Warrants		2,478		—		—		2,478
December 31, 2017
Liabilities:
Non-employee options	$	2,637		—		—	$	2,637
Warrants		6,941		—		—		6,941

There were no transfers between any levels for any of the periods presented.

Basic and Diluted Income (Loss) per Share

The basic and diluted loss per share for the periods noted below is as follows (amounts in thousands except shares and per share data):

	Three Months Ended
	March 31,
	2018			2017
Basic
Numerator:
Net loss	$	(1,165	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Basic net loss per share	$	(0.06	)	$	(0.32	)

Diluted
Numerator:
Net loss, basic	$	(1,165	)	$	(5,678	)
Effect of dilutive securities: Change in fair value of derivative financial instruments		(434	)		—
Net loss, diluted	$	(1,599	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Potential common share issuances:
Incremental dilutive shares from stock options and warrants (treasury stock method)		125,727			—
Weighted average common shares outstanding - diluted		20,460,656			17,573,966
Diluted net loss per share	$	(0.08	)	$	(0.32	)

Recent Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2018

Accounting Policies [Abstract]

Summary of Property, Plant and Equipment

The following tables summarizes the Company property, plant and equipment as of March 31, 2018 and December 31, 2017 (amounts in thousands).

	As of March 31, 2018			As of December 31, 2017
Leasehold improvement	$	173		$	173
Software and hardware		44			17
		217			190
Less accumulated depreciation		(27	)		(17	)
Total	$	190		$	173

Summary of Derivative Financial Instruments for Non-employee Stock Options

The following table summarizes the Company’s derivative financial instruments within the fair value hierarchy as of March 31, 2018 and December 31, 2017 (amounts in thousands):

	Fair Value		Level 1		Level 2		Level 3
March 31, 2018
Liabilities:
Non-employee options	$	1,329		—		—	$	1,329
Warrants		2,478		—		—		2,478
December 31, 2017
Liabilities:
Non-employee options	$	2,637		—		—	$	2,637
Warrants		6,941		—		—		6,941

Summary of Basic and Diluted Loss per Share

The basic and diluted loss per share for the periods noted below is as follows (amounts in thousands except shares and per share data):

	Three Months Ended
	March 31,
	2018			2017
Basic
Numerator:
Net loss	$	(1,165	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Basic net loss per share	$	(0.06	)	$	(0.32	)

Diluted
Numerator:
Net loss, basic	$	(1,165	)	$	(5,678	)
Effect of dilutive securities: Change in fair value of derivative financial instruments		(434	)		—
Net loss, diluted	$	(1,599	)	$	(5,678	)
Denominator:
Weighted average common shares outstanding - basic		20,334,929			17,573,966
Potential common share issuances:
Incremental dilutive shares from stock options and warrants (treasury stock method)		125,727			—
Weighted average common shares outstanding - diluted		20,460,656			17,573,966
Diluted net loss per share	$	(0.08	)	$	(0.32	)

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Common Stock and Warrants (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value of Warrants Granted in Offering/Financing Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions

The fair value of warrants outstanding as of March 31, 2018 and 2017 were estimated using the Black-Scholes option-pricing model with the following weighted average assumptions:

	March 31, 2018			March 31, 2017
Stock price	$	10.11		$	7.80
Exercise price	$	12.72		$	8.10
Warrant term	2.29 years			1.65 years
Expected volatility		63.77	%		94.21	%
Risk-free interest rate		2.26	%		0.75	%
Dividend rate		0.00	%		0.00	%

Fair Value of Compensation Options Granted During Offering Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions

The fair value of the compensation options granted during such offering was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:


Stock price	CAD $6.80
Exercise price	CAD $5.00
Option term	2.0 years
Expected volatility		126.76	%
Risk-free interest rate		0.61	%
Dividend rate		0.00	%

Summary of Warrants Accounts for Liabilities

The following table summarizes warrants that the Company accounts for as liabilities for the three months ended March 31, 2018 and 2017:

	Three Months Ended March 31,
	2018			2017
Fair value of warrants at beginning of period	$	6,941		$	2,857
Exercise of warrants		(2,509	)		—
Change in fair value of warrants during the period		(1,954	)		354
Fair value of warrants at end of period	$	2,478		$	3,211

Summary of Warrant Activity

The following is a summary of warrant activity during the three months ended March 31, 2018:

	Number of Warrants						Weighted Average Exercise Price
	CAD			US			CAD$		US$
Outstanding as of December 31, 2017		1,011,505			1,343,404		$	7.38	$	10.25
Granted		206			—			7.50		—
Exercised		(618	)		(555,556	)		5.83		6.75
Outstanding as of March 31, 2018		1,011,093			787,848		$	7.38	$	12.72

Warrants Outstanding and Exercisable

The warrants outstanding and exercisable as of March 31, 2018 were as follows:

Number of Warrants Outstanding		Exercise Price	Expiration Date
	90,406	US$15.00	April 30, 2018
	33,546	US$15.00	June 26, 2018
	3,795	US$10.75	June 26, 2020
	12,576	US$15.00	July 17, 2018
	1,509	US$10.75	July 17, 2020
	961,489	CAD$7.50	April 18, 2019
	49,604	CAD$5.00	April 18, 2018
	270,915	US$12.25	December 22, 2020
	171,020	US$12.25	December 28, 2020
	204,081	US$12.25	December 29, 2020
	1,798,941

December 2017 Financing

Fair Value of Warrants Granted in Offering/Financing Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions

The fair value of the warrants granted in the December 2017 financing were estimated using the Black-Scholes option pricing model with the following weighted average assumptions

	December 22, 2017			December 28, 2017			December 29, 2017
Stock price	$	10.60		$	12.45		$	12.32
Exercise price	$	12.25		$	12.25		$	12.25
Warrant term	3.0 years			3.0 years			3.0 years
Expected volatility		60.24	%		60.24	%		60.24	%
Risk-free interest rate		2.01	%		2.00	%		1.98	%
Dividend rate		0.00	%		0.00	%		0.00	%

Warrants Granted

Fair Value of Warrants Granted in Offering/Financing Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions

The fair value of the warrants granted in such offering was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:


Stock price	CAD $5.45
Exercise price	CAD $7.50
Warrant term	3.0 years
Expected volatility		83.83	%
Risk-free interest rate		0.60	%
Dividend rate		0.00	%

- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

+ References + Details

Share Based Payments (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Stock Option Activity

The following is a summary of stock option activity during the three months ended March 31, 2018:

				Weighted
				Average		Aggregate
	Number			Exercise Price		Intrinsic Value
	of Options			(CAD$)		(CAD$ in '000s)
Outstanding as of December 31, 2017		2,448,646		$	7.35	$	21,089
Exercised⁽¹⁾		(80,000	)		3.00	560
Outstanding as of March 31, 2018		2,368,646		$	7.50	$	13,119
Exercisable as of March 31, 2018		1,371,739		$	5.85	$	9,934

(1) For the three months ended March 31, 2018, 80,000 stock options were exercised on a cashless basis resulting in 17,091 common shares being withheld.

Summary of Stock-Based Compensation Expense is Classified in Condensed Consolidated Statements of Operations and Comprehensive Loss

Stock-based compensation expense is classified in the Company’s condensed consolidated statements of operations and comprehensive loss as follows (amounts in thousands):

	Three Months Ended March 31,
	2018		2017
Research and development	$	99	$	25
General and administrative		288		217
Total	$	387	$	242

Employee and Director Stock Options

Summary of Stock Options Outstanding and Exercisable

The following table summarizes stock options outstanding and exercisable by employees and directors as of March 31, 2018:

			Options
			Outstanding
Number of			Remaining						Number of
Options			Contractual Life		Exercise		Grant Date Fair		Options
Outstanding		Expiration Date	(In Years)		Price (CAD)		Value (CAD)		Exercisable
	360,000	June 18, 2019		1.22	$	3.00	$	1.00		360,000
	80,000	June 18, 2019		1.22	$	3.00	$	1.32		80,000
	20,000	December 8, 2019		1.69	$	14.60	$	6.55		20,000
	80,000	December 8, 2019		1.69	$	14.80	$	6.46		80,000
	20,000	March 16, 2020		1.96	$	16.00	$	7.09		20,000
	8,500	August 14, 2020		2.38	$	4.90	$	1.94		8,500
	150,000	October 21, 2020		2.56	$	4.20	$	1.80		112,500
	20,000	December 31, 2020		2.76	$	6.20	$	2.49		20,000
	595,000	July 13, 2020		2.29	$	6.95	$	3.23		396,666
	20,000	August 8, 2020		2.36	$	6.55	$	3.23		10,000
	617,000	April 17, 2027		9.05	$	10.80	$	7.76		-
	6,146	May 18, 2027		9.14	$	10.00	$	5.23		3,073
	10,000	May 18, 2027		9.14	$	10.00	$	7.63		-
	30,000	August 8, 2027		9.36	$	13.15	$	8.86		-
	2,016,646									1,110,739

Non-employee Stock Options

Summary of Stock Options Outstanding and Exercisable

The following table summarizes stock options outstanding and exercisable by non-employees as of March 31, 2018:

			Options
			Outstanding
Number of			Remaining						Number of
Options			Contractual Life		Exercise		Grant Date Fair		Options
Outstanding		Expiration Date	(In Years)		Price (CAD)		Value (CAD)		Exercisable
	80,000	June 18, 2019		1.22	$	3.00	$	1.32		80,000
	30,000	December 8, 2019		1.69	$	14.60	$	8.25		30,000
	82,000	October 3, 2020		2.76	$	6.75	$	4.00		41,000
	110,000	October 28, 2020		2.51	$	4.20	$	2.20		110,000
	20,000	May 18, 2027		9.14	$	10.00	$	8.69		-
	15,000	August 8, 2027		9.36	$	13.15	$	11.70		-
	15,000	November 6, 2027		9.61	$	20.65	$	19.93		-
	352,000									261,000

Summary of Non-Employee Stock Options Required to be Accounted for As Liabilities

The non-employee stock options that are required to be accounted for as liabilities are summarized as follows (amounts in thousands):

	Three Months Ended March 31,
	2018			2017
Fair value of non-employee options at beginning of period	$	2,637		$	1,617
Exercise of non-employee options		(737	)		—
Change in fair value of non-employee stock options during the period		(571	)		162
Fair value of non-employee options at end of period	$	1,329		$	1,779

Non-employee Liability

Estimation Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions

The fair value of non-employee liability classified awards as of March 31, 2018 and 2017 was estimated using the Black-Scholes option pricing model with the following weighted average assumptions:

	March 31, 2018			March 31, 2017
Stock price	CAD $12.87			CAD $10.50
Exercise price	CAD $4.83			CAD $6.15
Expected term	1.29 years			2.35 years
Expected volatility		67.92	%		85.39	%
Risk-free interest rate		1.60	%		0.81	%
Dividend rate		0.00	%		0.00	%

Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (amounts in thousands):

	March 31, 2018		December 31, 2017
Employee benefits	$	530	$	442
Legal expense		388		343
Professional services		256		88
Advance from U.S Army		233		233
Deferred rent		104		97
Severance		-		38
Other		1		1
	$	1,512	$	1,242

Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments Related to Non-cancellable Operating Lease Commitments

The future minimum lease payments related to the Company’s non-cancellable operating lease commitments were as follows (amounts in thousands):

For the Year Ending December 31,
2018 (remaining 9 months)	$	174
2019		246
2020		253
2021		260
2022		267
Thereafter		12
	$	1,212

Related Party Transactions (Tables)

3 Months Ended

Mar. 31, 2018

Summary of Private Placement Participation

The following table summarizes their participation (subscription amounts in thousands):

	Units Purchased		Subscription Amount
A&B (HK) Company Ltd.		204,081	$	2,000
Director 1		76,530		750
Director 2		51,019		500
CEO		25,510		250
CFO/COO		15,816		155
		372,956	$	3,655

Description of Business - Additional Information (Detail) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Jan. 22, 2018	Apr. 30, 2018 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) Subsidiary	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Description Of Business [Line Items]
Date of incorporation			Mar. 13, 2014
Number of wholly-owned subsidiaries \| Subsidiary			2
Reverse stock split	1-for-5
Reverse stock split, conversion ratio	5
Cash			$ 4,395	$ 5,562	$ 7,666	$ 2,669
Subsequent Event \| Underwritten Public Offering
Description Of Business [Line Items]
Warrants to purchase number of common stock, shares \| shares		2,463,185
Price per share \| $ / shares		$ 7.47
Net proceeds from offering after deducting underwriting discounts and commissions		$ 17,300
Estimated offering expenses		$ 1,000
Subsequent Event \| Common Stock \| Underwritten Public Offering
Description Of Business [Line Items]
Shares issued \| shares		2,463,185

Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) Segment shares	Mar. 31, 2017 shares
Schedule Of Significant Accounting Policies [Line Items]
Number of operating segment \| Segment	1
Number of Reportable Segments \| Segment	1
ASU 2014-09
Schedule Of Significant Accounting Policies [Line Items]
Revenue or contract with customer \| $	$ 0
Options
Schedule Of Significant Accounting Policies [Line Items]
Anti-dilutive securities excluded from calculation of diluted loss per share \| shares	2,208,646	1,957,000
Warrants
Schedule Of Significant Accounting Policies [Line Items]
Anti-dilutive securities excluded from calculation of diluted loss per share \| shares	1,818,439	2,017,152
Minimum
Schedule Of Significant Accounting Policies [Line Items]
Effective income tax rate	50.00%
Leasehold Improvements
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful life	5 years
Software and Hardware \| Minimum
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Software and Hardware \| Maximum
Schedule Of Significant Accounting Policies [Line Items]
Estimated useful life	5 years

Summary of Significant Accounting Policies - Summary of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 217	$ 190
Less accumulated depreciation	(27)	(17)
Total	190	173
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	173	173
Software and Hardware
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 44	$ 17

Summary of Significant Accounting Policies - Summary of Derivative Financial Instruments for Non-employee Stock Options (Details) - Fair Value, Measurements, Recurring - Black Scholes Model - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Non-employee Stock Options
Liabilities:
Fair value, liabilities	$ 1,329	$ 2,637
Warrants
Liabilities:
Fair value, liabilities	2,478	6,941
Level 3 \| Non-employee Stock Options
Liabilities:
Fair value, liabilities	1,329	2,637
Level 3 \| Warrants
Liabilities:
Fair value, liabilities	$ 2,478	$ 6,941

Summary of Significant Accounting Policies - Summary of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss	$ (1,165)	$ (5,678)
Denominator:
Weighted average common shares outstanding - basic	20,334,929	17,573,966
Basic net loss per share	$ (0.06)	$ (0.32)
Numerator:
Net loss, basic	$ (1,165)	$ (5,678)
Effect of dilutive securities: Change in fair value of derivative financial instruments	(434)
Net loss, diluted	$ (1,599)	$ (5,678)
Weighted average shares outstanding
Weighted average common shares outstanding - basic	20,334,929	17,573,966
Potential common share issuances:
Incremental dilutive shares from stock options and warrants (treasury stock method)	125,727
Weighted average common shares outstanding - diluted	20,460,656	17,573,966
Diluted net loss per share	$ (0.08)	$ (0.32)

Common Stock and Warrants - Additional Information (Detail)												1 Months Ended		3 Months Ended
	Dec. 29, 2017 USD ($) shares	Dec. 28, 2017 USD ($) shares	Dec. 22, 2017 USD ($) shares	Jun. 28, 2017 USD ($) shares	Feb. 16, 2017 USD ($) shares	May 02, 2016 USD ($) shares	May 02, 2016 $ / shares shares	Apr. 18, 2016 USD ($) shares	Apr. 18, 2016 $ / shares shares	Dec. 29, 2015 USD ($) $ / shares shares	Nov. 30, 2015 $ / shares shares	Dec. 31, 2017 USD ($) Tranche $ / shares shares	Nov. 30, 2017 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) $ / shares shares	Mar. 31, 2017 USD ($)	Mar. 31, 2018 $ / shares	Oct. 09, 2015 USD ($)
Schedule Of Stockholders Equity [Line Items]
Class A common share, voting rights														One vote per share
Class A common share, dividends declared														$ 0
Share issuance cost and commission paid														73,000	$ 1,239,000
Gross proceeds from issuance of common stock														$ 0	$ 9,187,000
Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Warrant exercisable price per share \| $ / shares																$ 7.50
Warrants expiration date														Apr. 18, 2019
Short Form Prospectus Offering in Canada and U.S. Private Placement
Schedule Of Stockholders Equity [Line Items]
Warrant exercisable price per share \| $ / shares									$ 7.50
Proceeds from issuance of units								$ 7,200,000
Price per share \| $ / shares									$ 5.00
Warrants expiration date								Apr. 18, 2019
Number of common stock converted by each warrant \| shares									1
Share issuance cost and commission paid								$ 300,000
Options exercisable to purchase units \| shares								87,210
Options exercise price per unit \| $ / shares									$ 5.00
Offering expiration period								24 months
Other cash issuance costs related to offering								$ 1,100,000
Short Form Prospectus Offering in Canada and U.S. Private Placement \| Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Description of units issued														Each Unit consists of one Class A common share in the capital of the Company (a “Common Share’) and one half of one Common Share purchase warrant (each whole warrant, a “Warrant”).
Over-Allotment Option
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units						$ 8,100,000
Price per share \| $ / shares							$ 5.00
Warrants expiration date						Apr. 18, 2019
Number of common stock converted by each warrant \| shares							1
Share issuance cost and commission paid						$ 100,000
Options exercisable to purchase units \| shares						13,081
Options exercise price per unit \| $ / shares							$ 5.00
Offering expiration period						24 months
Number of shares issued in transaction \| shares						218,025
Gross proceeds from issuance of units						$ 900,000
Over-Allotment Option \| Warrants Expiration Date, April 18, 2019
Schedule Of Stockholders Equity [Line Items]
Description of units issued														Each over-allotment warrant entitles the holder thereof to acquire one additional over-allotment Common Share at an exercise price of CAD $7.50 on or before April 18, 2019
Public Offering \| Common Stock
Schedule Of Stockholders Equity [Line Items]
Share issuance cost and commission paid					$ 1,200,000
Issuance of common stock in public offering \| shares					1,311,000
Gross proceeds from issuance of common stock					$ 9,200,000
Private Placement
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units												$ 3,655,000
Number of shares issued in transaction \| shares												372,956
Private Placement \| Common Stock
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units				$ 5,400,000
Share issuance cost and commission paid				$ 9,000
Number of shares issued in transaction \| shares				800,000
December 2017 Financing
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units												$ 6,300,000
Price per share \| $ / shares												$ 9.80
Description of units issued														Each unit consisted of one share of Class A common stock of the Company at a price of $9.80 per share, and one share purchase warrant.
Number of common stock converted by each warrant \| shares												1
Share issuance cost and commission paid												$ 100,000
Options exercise price per unit \| $ / shares												$ 12.25
Offering expiration period												36 months
Number of shares issued in transaction \| shares												646,016
Number of tranches \| Tranche												3
December 2017 Financing \| Tranche One
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units			$ 2,600,000
Number of shares issued in transaction \| shares			270,915
December 2017 Financing \| Tranche Two
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units		$ 1,700,000
Number of shares issued in transaction \| shares		171,020
December 2017 Financing \| Tranche Three
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units	$ 2,000,000
Number of shares issued in transaction \| shares	204,081
$2.0 million note
Schedule Of Stockholders Equity [Line Items]
Debt conversion, converted instrument, shares issued \| shares											416,666
Common stock conversion price per share \| $ / shares											$ 4.80
Warrants exercisable \| shares											208,333
Warrant exercisable price per share \| $ / shares											$ 7.20
Warrants exercisable period											3 years
Additional funding commitment
Schedule Of Stockholders Equity [Line Items]
Debt conversion, original debt, amount										$ 5,000,000
Debt conversion, converted instrument, shares issued \| shares										1,111,111
Common stock conversion price per share \| $ / shares										$ 4.50
Warrants exercisable \| shares										555,556
Warrant exercisable price per share \| $ / shares										$ 6.75
Warrants exercisable period										3 years
A&B Company Limited
Schedule Of Stockholders Equity [Line Items]
Class of warrants exercised \| shares													208,333	555,556
Class of warrant or right exercise price per share \| $ / shares													$ 7.20	$ 6.75
Proceeds received from exercise of outstanding warrants													$ 1,500,000	$ 3,800,000
A&B Company Limited \| Private Placement
Schedule Of Stockholders Equity [Line Items]
Proceeds from issuance of units												$ 2,000,000
Number of shares issued in transaction \| shares												204,081
Asset Purchase Agreement \| A&B Company Limited
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																	$ 7,000,000
Asset Purchase Agreement \| A&B Company Limited \| $2.0 million note
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																	2,000,000
Asset Purchase Agreement \| A&B Company Limited \| Additional funding commitment
Schedule Of Stockholders Equity [Line Items]
Convertible promissory note																	$ 5,000,000

Common Stock and Warrants - Fair Value of Warrants Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions (Detail)				3 Months Ended
	Dec. 29, 2017 $ / shares	Dec. 28, 2017 $ / shares	Dec. 22, 2017 $ / shares	Mar. 31, 2018 $ / shares	Mar. 31, 2017 $ / shares	Mar. 31, 2018 $ / shares
Warrants Granted
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Stock price						$ 5.45
Exercise price						$ 7.50
Warrant term				3 years
Expected volatility				83.83%
Risk-free interest rate				0.60%
Dividend rate				0.00%
Warrants Granted \| December 2017 Financing
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Stock price	$ 12.32	$ 12.45	$ 10.60
Exercise price	$ 12.25	$ 12.25	$ 12.25
Warrant term	3 years	3 years	3 years
Expected volatility	60.24%	60.24%	60.24%
Risk-free interest rate	1.98%	2.00%	2.01%
Dividend rate	0.00%	0.00%	0.00%
Warrants Outstanding
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Stock price				$ 10.11	$ 7.80
Exercise price				$ 12.72	$ 8.10
Warrant term				2 years 3 months 14 days	1 year 7 months 24 days
Expected volatility				63.77%	94.21%
Risk-free interest rate				2.26%	0.75%
Dividend rate				0.00%	0.00%

Common Stock and Warrants - Fair Value of Compensation Options Granted Estimated Using Black-Scholes Option Pricing Model with Weighted Average Assumptions (Detail) - Options	3 Months Ended
	Mar. 31, 2018 $ / shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price	$ 6.80
Exercise price	$ 5.00
Option term	2 years
Expected volatility	126.76%
Risk-free interest rate	0.61%
Dividend rate	0.00%

Common Stock and Warrants - Summary of Warrants Accounts for as Liabilities (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair value of warrants at beginning of period	$ 6,941	$ 2,857
Exercise of warrants	(2,509)
Change in fair value of warrants during the period	(1,954)	354
Fair value of warrants at end of period	$ 2,478	$ 3,211

Common Stock and Warrants - Summary of Warrant Activity (Detail)	3 Months Ended
	Mar. 31, 2018 $ / shares shares	Mar. 31, 2018 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding, ending balance	1,798,941	1,798,941
CAD
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding, beginning balance	1,011,505	1,011,505
Number of Warrants, Granted	206	206
Number of Warrants, Exercised	(618)	(618)
Number of Warrants, Outstanding, ending balance	1,011,093	1,011,093
Weighted-Average Exercise Price, Outstanding, beginning balance \| $ / shares		$ 7.38
Weighted-Average Exercise Price, Granted \| $ / shares		7.50
Weighted-Average Exercise Price, Exercised \| $ / shares		5.83
Weighted-Average Exercise Price, Outstanding, ending balance \| $ / shares		$ 7.38
USD
Class Of Warrant Or Right [Line Items]
Number of Warrants, Outstanding, beginning balance	1,343,404	1,343,404
Number of Warrants, Exercised	(555,556)	(555,556)
Number of Warrants, Outstanding, ending balance	787,848	787,848
Weighted-Average Exercise Price, Outstanding, beginning balance \| $ / shares	$ 10.25
Weighted-Average Exercise Price, Exercised \| $ / shares	6.75
Weighted-Average Exercise Price, Outstanding, ending balance \| $ / shares	$ 12.72

Common Stock and Warrants - Warrants Outstanding and Exercisable (Detail)	3 Months Ended
	Mar. 31, 2018 $ / shares shares	Mar. 31, 2018 $ / shares shares
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	1,798,941	1,798,941
Warrants Expiration Date, April 30, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	90,406	90,406
Exercise Price \| $ / shares	$ 15.00
Expiration Date	Apr. 30, 2018
Warrants Expiration Date, June 26, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	33,546	33,546
Exercise Price \| $ / shares	$ 15.00
Expiration Date	Jun. 26, 2018
Warrants Expiration Date, June 26, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	3,795	3,795
Exercise Price \| $ / shares	$ 10.75
Expiration Date	Jun. 26, 2020
Warrants Expiration Date, July 17, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	12,576	12,576
Exercise Price \| $ / shares	$ 15.00
Expiration Date	Jul. 17, 2018
Warrants Expiration Date, July 17, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	1,509	1,509
Exercise Price \| $ / shares	$ 10.75
Expiration Date	Jul. 17, 2020
Warrants Expiration Date, April 18, 2019
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	961,489	961,489
Exercise Price \| $ / shares		$ 7.50
Expiration Date	Apr. 18, 2019
Warrants Expiration Date, April 18, 2018
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	49,604	49,604
Exercise Price \| $ / shares		$ 5.00
Expiration Date	Apr. 18, 2018
Warrants Expiration Date, December 22, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	270,915	270,915
Exercise Price \| $ / shares	$ 12.25
Expiration Date	Dec. 22, 2020
Warrants Expiration Date, December 28, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	171,020	171,020
Exercise Price \| $ / shares	$ 12.25
Expiration Date	Dec. 28, 2020
Warrants Expiration Date, December 29, 2020
Class Of Warrant Or Right [Line Items]
Number of Warrants Outstanding	204,081	204,081
Exercise Price \| $ / shares	$ 12.25
Expiration Date	Dec. 29, 2020

Share Based Payments - Additional Information (Detail) $ / shares in Units, $ in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) shares	Mar. 31, 2018 CAD ($) shares	Dec. 31, 2017 shares	Jun. 30, 2017	Mar. 31, 2017 USD ($) shares	Mar. 31, 2018 $ / shares	Aug. 08, 2016 shares	Jun. 18, 2014 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock remaining available for grant	2,733,614
Number of stock option issued	0	0			0
Aggregate intrinsic value of stock options exercised	$ 0.6	$ 560			$ 0.1
Employee and Director Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock options outstanding \| $	$ 3.3				$ 1.0
Weighted-average remaining vesting period	2 years 3 months 18 days	2 years 3 months 18 days			1 year 2 months 12 days
Non-employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to non-vested stock options outstanding \| $	$ 0.2				$ 0.0
Weighted-average remaining vesting period	1 year 1 month 6 days	1 year 1 month 6 days
2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized and approved to issue under plan								2,421,603
2016 Omnibus Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock shares authorized and approved to issue under plan							3,000,000
2016 Omnibus Incentive Plan \| Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate amount of stock excess award			60,000
2016 Omnibus Incentive Plan \| Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period				3 years
Vesting percentage				25.00%
Oustanding shares	4,915
Weighted average granted date fair value \| $ / shares						$ 10.00
Vested shares	2,987	2,987
Issued shares	0	0
Exercised shares	0	0
Forfeited shares	0	0

Share Based Payments - Summary of Stock Option Activity (Detail) $ / shares in Units, $ in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) shares	Mar. 31, 2018 CAD ($) $ / shares shares	Mar. 31, 2017 USD ($)
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options, Beginning balance outstanding \| shares	2,448,646	2,448,646
Number of Options, Exercised \| shares	(80,000)	(80,000)
Number of Options, Ending balance outstanding \| shares	2,368,646	2,368,646
Number of Options, Exercisable \| shares		1,371,739
Weighted Average Exercise Price, Beginning balance outstanding \| $ / shares		$ 7.35
Weighted Average Exercise Price, Exercised \| $ / shares		3.00
Weighted Average Exercise Price, Ending balance outstanding \| $ / shares		7.50
Weighted Average Exercise Price, Exercisable \| $ / shares		$ 5.85
Aggregate Intrinsic Value, Beginning balance outstanding \| $		$ 21,089
Aggregate Intrinsic Value, Exercised	$ 0.6	560	$ 0.1
Aggregate Intrinsic Value, Ending balance outstanding \| $		13,119
Aggregate Intrinsic Value, Exercisable \| $		$ 9,934

Share Based Payments - Summary of Stock Option Activity (Parenthetical) (Detail)	3 Months Ended
	Mar. 31, 2018 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options exercised on cashless basis	80,000
Number of common stock shares withheld	17,091

Share Based Payments - Summary of Stock Options Outstanding and Exercisable (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	2,368,646	2,448,646
Exercise Price	$ 7.50	$ 7.35
Number of Options Exercisable	1,371,739
Employee and Director Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	2,016,646
Number of Options Exercisable	1,110,739
Employee and Director Stock Options \| Option One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	360,000
Expiration Date	Jun. 18, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 2 months 19 days
Exercise Price	$ 3.00
Grant Date Fair Value	$ 1.00
Number of Options Exercisable	360,000
Employee and Director Stock Options \| Option Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	80,000
Expiration Date	Jun. 18, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 2 months 19 days
Exercise Price	$ 3.00
Grant Date Fair Value	$ 1.32
Number of Options Exercisable	80,000
Employee and Director Stock Options \| Option Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	20,000
Expiration Date	Dec. 08, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 8 months 8 days
Exercise Price	$ 14.60
Grant Date Fair Value	$ 6.55
Number of Options Exercisable	20,000
Employee and Director Stock Options \| Option Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	80,000
Expiration Date	Dec. 08, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 8 months 8 days
Exercise Price	$ 14.80
Grant Date Fair Value	$ 6.46
Number of Options Exercisable	80,000
Employee and Director Stock Options \| Option Five
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	20,000
Expiration Date	Mar. 16, 2020
Options Outstanding Remaining Contractual Life (In Years)	1 year 11 months 15 days
Exercise Price	$ 16.00
Grant Date Fair Value	$ 7.09
Number of Options Exercisable	20,000
Employee and Director Stock Options \| Option Six
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	8,500
Expiration Date	Aug. 14, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 4 months 17 days
Exercise Price	$ 4.90
Grant Date Fair Value	$ 1.94
Number of Options Exercisable	8,500
Employee and Director Stock Options \| Option Seven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	150,000
Expiration Date	Oct. 21, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 6 months 21 days
Exercise Price	$ 4.20
Grant Date Fair Value	$ 1.80
Number of Options Exercisable	112,500
Employee and Director Stock Options \| Option Eight
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	20,000
Expiration Date	Dec. 31, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 9 months 3 days
Exercise Price	$ 6.20
Grant Date Fair Value	$ 2.49
Number of Options Exercisable	20,000
Employee and Director Stock Options \| Option Nine
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	595,000
Expiration Date	Jul. 13, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 3 months 14 days
Exercise Price	$ 6.95
Grant Date Fair Value	$ 3.23
Number of Options Exercisable	396,666
Employee and Director Stock Options \| Option Ten
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	20,000
Expiration Date	Aug. 08, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 4 months 9 days
Exercise Price	$ 6.55
Grant Date Fair Value	$ 3.23
Number of Options Exercisable	10,000
Employee and Director Stock Options \| Option Eleven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	617,000
Expiration Date	Apr. 17, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 18 days
Exercise Price	$ 10.80
Grant Date Fair Value	$ 7.76
Employee and Director Stock Options \| Option Twelve
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	6,146
Expiration Date	May 18, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 1 month 20 days
Exercise Price	$ 10.00
Grant Date Fair Value	$ 5.23
Number of Options Exercisable	3,073
Employee and Director Stock Options \| Option Thirteen
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	10,000
Expiration Date	May 18, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 1 month 20 days
Exercise Price	$ 10.00
Grant Date Fair Value	$ 7.63
Employee and Director Stock Options \| Option Fourteen
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	30,000
Expiration Date	Aug. 08, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 4 months 9 days
Exercise Price	$ 13.15
Grant Date Fair Value	$ 8.86
Non-employee Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	352,000
Number of Options Exercisable	261,000
Non-employee Stock Options \| Option One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	80,000
Expiration Date	Jun. 18, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 2 months 19 days
Exercise Price	$ 3.00
Grant Date Fair Value	$ 1.32
Number of Options Exercisable	80,000
Non-employee Stock Options \| Option Two
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	30,000
Expiration Date	Dec. 08, 2019
Options Outstanding Remaining Contractual Life (In Years)	1 year 8 months 8 days
Exercise Price	$ 14.60
Grant Date Fair Value	$ 8.25
Number of Options Exercisable	30,000
Non-employee Stock Options \| Option Three
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	82,000
Expiration Date	Oct. 03, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 9 months 3 days
Exercise Price	$ 6.75
Grant Date Fair Value	$ 4.00
Number of Options Exercisable	41,000
Non-employee Stock Options \| Option Four
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	110,000
Expiration Date	Oct. 28, 2020
Options Outstanding Remaining Contractual Life (In Years)	2 years 6 months 3 days
Exercise Price	$ 4.20
Grant Date Fair Value	$ 2.20
Number of Options Exercisable	110,000
Non-employee Stock Options \| Option Five
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	20,000
Expiration Date	May 18, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 1 month 20 days
Exercise Price	$ 10.00
Grant Date Fair Value	$ 8.69
Non-employee Stock Options \| Option Six
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	15,000
Expiration Date	Aug. 08, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 4 months 9 days
Exercise Price	$ 13.15
Grant Date Fair Value	$ 11.70
Non-employee Stock Options \| Option Seven
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options Outstanding	15,000
Expiration Date	Nov. 06, 2027
Options Outstanding Remaining Contractual Life (In Years)	9 years 7 months 9 days
Exercise Price	$ 20.65
Grant Date Fair Value	$ 19.93

Share Based Payments - Summary of Non-Employee Stock Options Required to be Accounted for As Liabilities (Detail) - Non-employee Stock Options - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of non-employee options at beginning of period	$ 2,637	$ 1,617
Exercise of non-employee options	(737)
Change in fair value of non-employee stock options during the period	(571)	162
Fair value of non-employee options at end of period	$ 1,329	$ 1,779

Share Based Payments - Schedule of Fair Value of Non-Employee Liability Classified Award Estimated Using Black-Scholes Option Pricing Model With Following Weighted Average Assumptions (Details) - Non-employee Liability - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price	$ 12.87	$ 10.50
Exercise price	$ 4.83	$ 6.15
Expected term	1 year 3 months 14 days	2 years 4 months 6 days
Expected volatility	67.92%	85.39%
Risk-free interest rate	1.60%	0.81%
Dividend rate	0.00%	0.00%

Share Based Payments - Summary of Stock-Based Compensation Expense is Classified in Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 387	$ 242
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	99	25
General and Administrative Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total	$ 288	$ 217

Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables And Accruals [Abstract]
Employee benefits	$ 530	$ 442
Legal expense	388	343
Professional services	256	88
Advance from U.S Army	233	233
Deferred rent	104	97
Severance		38
Other	1	1
Total accrued expenses	$ 1,512	$ 1,242

Commitments and Contingencies - Additional Information (Details) - USD ($)			1 Months Ended			3 Months Ended
	Dec. 29, 2017	Jan. 22, 2013	Jul. 31, 2017	Mar. 31, 2017	Nov. 30, 2014	Mar. 31, 2018	Oct. 30, 2017
Commitments And Contingencies [Line Items]
Lease commencement date			Jul. 17, 2017	Jul. 01, 2017
Lease termination date			Jan. 16, 2023	Dec. 31, 2022
Lease option to extend termination year				2027
Lease option to extend termination date			Jan. 31, 2028
Lease monthly rent plus utilities			$ 20,000
Lease monthly rent plus utilities beginning date			Jan. 31, 2018
Lease annual increase in rental percentage			3.00%
Advanced NeuroRehabilitation, LLC \| License Agreement for Exclusive Right on Patent Pending Technology
Commitments And Contingencies [Line Items]
Issuance of common stock for license agreement		3,207,005
Percentage of royalty on net revenue		4.00%
A&B Company Limited \| Asset Purchase Agreement
Commitments And Contingencies [Line Items]
Contract penalty payable on failure to obtain FDA clearance							$ 2,000,000
Altair LLC
Commitments And Contingencies [Line Items]
Percentage of royalty on sales					7.00%
Key Tronic Corporation \| Manufacturing and Supply Agreement
Commitments And Contingencies [Line Items]
Agreement description						On December 29, 2017, NHC, a wholly owned subsidiary of the Company entered into a Manufacturing and Supply Agreement (“MSA”) with Key Tronic Corporation (“Key Tronic”), for the manufacture and supply of the Company’s PoNS device based upon the Company’s product specifications as set forth in the MSA. Per the agreement, the Company shall provide to Key Tronic a rolling forecast for the procurement of parts and material and within normal lead times based on estimated delivery dates for the manufacture of the PoNS device. The term of the agreement will be for three-years and will automatically renew for additional consecutive terms of one year, unless cancelled by either party upon 180-day written notice to the other party prior to the end of the then current term. As of March 31, 2018, no initial forecast had been provided to Key Tronic by the Company.
Agreement term	3 years
Agreement auto renewal period	1 year
Notice period to cancel the renewal of agreement	180 days

Commitments and Contingencies - Schedule of Future Minimum Lease Payments Related to Non-cancellable Operating Lease Commitments (Detail) $ in Thousands	Mar. 31, 2018 USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
2018 (remaining 9 months)	$ 174
2019	246
2020	253
2021	260
2022	267
Thereafter	12
Future minimum lease payments, total	$ 1,212

Related Party Transactions - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Change in fair value of derivative financial instruments		$ 2,525,000	$ (516,000)
Non-employee Stock Options
Related Party Transaction [Line Items]
Change in fair value of derivative financial instruments		200,000	(48,000)
Minimum \| A&B (HK) Company Ltd.
Related Party Transaction [Line Items]
Ownership percentage of common stock shares outstanding				5.00%
Directors
Related Party Transaction [Line Items]
Consulting fees paid		$ 3,000	18,000
Montel Media, Inc. \| Minimum
Related Party Transaction [Line Items]
Beneficially owns common stock percentage		5.00%
Montel Media, Inc. \| Consulting Agreement
Related Party Transaction [Line Items]
Consulting fees paid		$ 45,000	45,000
Consulting monthly fee	$ 15,000
Clinvue LLC
Related Party Transaction [Line Items]
Consulting fees paid		$ 100,000	$ 0
CEO \| Minimum
Related Party Transaction [Line Items]
Ownership percentage of common stock shares outstanding				5.00%
CFO/CEO \| Minimum
Related Party Transaction [Line Items]
Ownership percentage of common stock shares outstanding				5.00%
Director 1 \| Minimum
Related Party Transaction [Line Items]
Ownership percentage of common stock shares outstanding				5.00%
Director 2 \| Minimum
Related Party Transaction [Line Items]
Ownership percentage of common stock shares outstanding				5.00%

Related Party Transactions - Summary of Private Placement Participation (Detail) - Private Placement $ in Thousands	1 Months Ended
	Dec. 31, 2017 USD ($) shares
Related Party Transaction [Line Items]
Units Purchased \| shares	372,956
Subscription Amount \| $	$ 3,655
A&B (HK) Company Ltd.
Related Party Transaction [Line Items]
Units Purchased \| shares	204,081
Subscription Amount \| $	$ 2,000
Director 1
Related Party Transaction [Line Items]
Units Purchased \| shares	76,530
Subscription Amount \| $	$ 750
Director 2
Related Party Transaction [Line Items]
Units Purchased \| shares	51,019
Subscription Amount \| $	$ 500
CEO
Related Party Transaction [Line Items]
Units Purchased \| shares	25,510
Subscription Amount \| $	$ 250
CFO/CEO
Related Party Transaction [Line Items]
Units Purchased \| shares	15,816
Subscription Amount \| $	$ 155

Sole-Source Cost-Sharing Agreement - Additional Information (Detail) - USAMRMC - USD ($)		1 Months Ended	3 Months Ended
	Nov. 07, 2017	Jul. 31, 2015	Mar. 31, 2018	Sep. 30, 2017
Schedule Of Cost Sharing Agreement [Line Items]
Expiration date of original contract			Dec. 31, 2016
Reimbursement received			$ 3,000,000
Reimbursement received recorded as advance against final milestone			$ 200,000
Extended expiration date of original contract	Dec. 31, 2018
Maximum
Schedule Of Cost Sharing Agreement [Line Items]
Reimbursable trial cost		$ 3,000,000
Cooperative Research and Development Agreement
Schedule Of Cost Sharing Agreement [Line Items]
Extended expiration date of original contract				Dec. 31, 2021
Expiration year of original contract				2018

Subsequent Events - Additional Information (Detail) - Subsequent Event - Underwritten Public Offering $ / shares in Units, $ in Millions	1 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares
Subsequent Event [Line Items]
Warrants to purchase number of common stock, shares \| shares	2,463,185
Price per share \| $ / shares	$ 7.47
Net proceeds from offering after deducting underwriting discounts and commissions \| $	$ 17.3
Estimated offering expenses \| $	$ 1.0
Common Stock
Subsequent Event [Line Items]
Shares issued \| shares	2,463,185