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Stock Based Compensation (Stock Option Activity) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Total Number of Shares, outstanding Beginning Balance	7,672
Stock options activity, Total Number of Shares, Granted	7,113
Stock options activity, Total Number of Shares, Exercised	(289)
Stock options activity, Total Number of Shares, Cancelled	(1,337)
Total Number of Shares, outstanding Ending Balance	13,159
Total Number of Shares, exercisable	6,557
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	$ 2.54
Stock options activity, Weighted Average Exercise Price, Granted	$ 2.87
Stock options activity, Weighted Average Exercise Price, Exercised	$ 1.21
Stock options activity, Weighted Average Exercise Price, Cancelled	$ 2.80
Stock options activity, Weighted Average Exercise Price, Ending balance	$ 2.73
Stock options activity, Weighted Average Exercise Price, exercisable	$ 2.63
Stock options activity, Aggregate Intrinsic Value, Beginning balance	$ 2,288
Stock options activity, Aggregate Intrinsic Value, Ending balance	$ 30,537

X

- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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- Definition

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 of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including 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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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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