Fair value of warrants on the date that the warrants were originally issued.

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Warrants Issued, Expiration Period

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Exercise price per share or per unit of warrants or rights outstanding.

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Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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Stockholders' Equity - Additional Information (Detail) - USD ($)			1 Months Ended	12 Months Ended
	Sep. 30, 2016	Jun. 21, 2016	Jul. 31, 2006	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 07, 2014
Equity [Abstract]
Common stock, par value (in dollars per share)				$ 0.001	$ 0.001
Common stock, shares authorized (in shares)				125,000,000	125,000,000
Common stock, shares outstanding (in shares)				24,609,411	13,905,599	8,512,103
Common stock, shares issued (in shares)				24,609,411	13,905,599
Preferred shares authorized (in shares)				5,000,000	5,000,000		5,000,000
Preferred shares par value (in dollars per share)				$ 0.001	$ 0.001		$ 0.001
Preferred shares issued (in shares)				0	0
Preferred shares outstanding (in shares)				0	0
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock (in shares)				14,033	14,033
Change in fair value of derivative liability				$ 1,906,000	$ 0	$ 0
Warrant liability				6,601,000	0
Warrants Associated with Loan Agreement
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock (in shares)	122,435
Exercise price of warrants (in dollars per share)	$ 3.6754
Warrants issued, expiration period (in years)	5 years
June 2016 Public Offering
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock (in shares)		4,218,750
Exercise price of warrants (in dollars per share)		$ 3.00
Number of shares received per warrant (in shares)		0.45
Warrants issued, expiration period (in years)		5 years
Series C-1 Convertible Preferred Stock
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock (in shares)			196,923
Exercise price of warrants (in dollars per share)			$ 3.25
Fair value of warrant on issuance date			$ 459,000
Derivative liability				$ 0	$ 0
Common Stock
Schedule of Capitalization, Equity [Line Items]
Number of warrants issued to purchase common stock (in shares)			14,033
Exercise price of warrants (in dollars per share)			$ 45.61