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Majority outstanding shares redeemable date.

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Number of redemption price accrued and unpaid dividends installment payments.

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Preferred stock conversion price per share.

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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 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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Number of shares of common stock issued as dividends during the period. Excludes stock splits.

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Number of shares issued for each share of convertible preferred stock that is converted.

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The amount of accretion of the preferred stock redemption discount during the period.

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The percentage rate used to calculate dividend payments on preferred stock.

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Number of new stock issued during the period.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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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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The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Redeemable Convertible Preferred Stock and Common Stock - Additional Information (Detail) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) Installment $ / shares shares	Jun. 30, 2017 USD ($) shares	Dec. 31, 2017 USD ($) $ / shares	Aug. 01, 2017 $ / shares shares	May 31, 2012 shares
Temporary Equity [Line Items]
Accretion amount \| $	$ 10	$ 10	$ 30	$ 30
Common Stock
Temporary Equity [Line Items]
Common stock issued as payment of accrued dividends			182,025
Shares issued during period			228,305
Common Stock \| Restricted Stock Units (RSUs)
Temporary Equity [Line Items]
Shares issued in connection with Employee Stock Purchase Plan and vesting of restricted stock units			46,280
Series A Convertible Preferred Stock
Temporary Equity [Line Items]
Warrants to purchase common stock							325,000
Cumulative dividends at a rate			6.00%
Redeemable convertible preferred stock, liquidation preference per share \| $ / shares	$ 5.00		$ 5.00
Common stock issued as payment of accrued dividends			182,025	149,422
Series A Convertible Preferred Stock \| Common Stock \| Repricing Agreement
Temporary Equity [Line Items]
Conversion price per share \| $ / shares						$ 2.26
Convertible preferred stock, shares issuable upon conversion						2,212,389
Series A Convertible Preferred Stock \| Scenario, Plan
Temporary Equity [Line Items]
Redeemable convertible preferred stock, liquidation preference per share \| $ / shares	5.00		$ 5.00
Redemption price per share \| $ / shares	$ 5.00		$ 5.00		$ 5.00
Number of redemption price, accrued and unpaid dividends installment payments \| Installment			36
Annual interest rate on redemption value payable			6.00%
Series A Convertible Preferred Stock \| Scenario, Plan \| Maximum
Temporary Equity [Line Items]
Majority outstanding shares redeemable date			Apr. 30, 2017
Series A Convertible Preferred Stock \| Accounts Payable and Other Accrued Expenses
Temporary Equity [Line Items]
Total accrued but unpaid dividends \| $	$ 80		$ 80		$ 80
Series A Warrants \| Common Stock \| Repricing Agreement
Temporary Equity [Line Items]
Warrants to purchase common stock						125,000
Warrant exercise price per share \| $ / shares						$ 2.72
Series B Warrants \| Common Stock \| Repricing Agreement
Temporary Equity [Line Items]
Warrants to purchase common stock						200,000
Warrant exercise price per share \| $ / shares						$ 3.17