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Stock Based Compensation (Stock Option Activity) (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Total Number of Shares, outstanding Beginning Balance | shares	13,262
Stock options activity, Total Number of Shares, Granted | shares	166
Stock options activity, Total Number of Shares, Exercised | shares	(167)
Stock options activity, Total Number of Shares, Cancelled | shares	(2,952)
Total Number of Shares, outstanding Ending Balance | shares	10,309
Total Number of Shares, exercisable | shares	5,970
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Stock options activity, Weighted Average Exercise Price, Beginning balance | $ / shares	$ 2.58
Stock options activity, Weighted Average Exercise Price, Granted | $ / shares	1.27
Stock options activity, Weighted Average Exercise Price, Exercised | $ / shares	1.57
Stock options activity, Weighted Average Exercise Price, Cancelled | $ / shares	3.07
Stock options activity, Weighted Average Exercise Price, Ending balance | $ / shares	2.44
Stock options activity, Weighted Average Exercise Price, exercisable | $ / shares	$ 2.97
Stock options activity, Aggregate Intrinsic Value, Beginning balance | $
Stock options activity, Aggregate Intrinsic Value, Granted | $
Stock options activity, Aggregate Intrinsic Value, Exercised | $	56
Stock options activity, Aggregate Intrinsic Value, Cancelled | $	0
Stock options activity, Aggregate Intrinsic Value, Ending balance | $	0
Stock options activity, Aggregate Intrinsic Value, exercisable | $	$ 0

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
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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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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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.

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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 grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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

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