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Stock Options and Stock Grants - Summary of Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Outstanding, Number, Beginning Balance	2,440,000
Shares, Granted	461,000
Stock option exercises, Shares	(69,000)	(35,000)
Shares, Forfeited or expired	(258,000)
Outstanding, Number, Ending Balance	2,574,000	2,440,000
Shares, Exercisable	1,656,000
Shares available for grant	445,000
Weighted Average Exercise Price per Share, Beginning Balance	$ 1.15
Weighted Average Exercise Price per Share, Granted	0.44
Weighted Average Exercise Price per Share, Exercised	0.37
Weighted Average Exercise Price per Share, Forfeited or expired	2.20
Weighted Average Exercise Price per Share, Ending Balance	0.95	$ 1.15
Weighted Average Exercise Price per Share, Exercisable	$ 1.21
Weighted Average Remaining Contractual Term, Outstanding	5 years 6 months
Weighted Average Remaining Contractual Term Years, Exercisable	5 years 6 months
Aggregate Intrinsic Value, Outstanding	$ 41
Aggregate Intrinsic Value, Exercisable	$ 41

X

- Definition

Amount of common stock allocated to investors to buy shares of a new issue of common stock before they are offered to the public. When stock is sold on a subscription basis, the issuer does not initially receive the total proceeds. In general, the issuer does not issue the shares to the investor until it receives the entire proceeds.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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