Stock Incentive and Employee Stock Purchase Plans - Summary of Stock Option Activity (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Options Outstanding, December 31, 2012	4,282
Stock Options Outstanding, Granted	425
Stock Options Outstanding, Exercised	(38)
Stock Options Outstanding, Cancelled	(736)
Stock Options Outstanding, December 31, 2013	3,933
Options Exercisable, December 31, 2013	3,394
Weighted Average Exercise Price Per Option, Options outstanding, December 31, 2012	$ 10.25
Weighted Average Exercise Price Per Option, Granted	$ 2.10
Weighted Average Exercise Price Per Option, Exercised	$ 2.68
Weighted Average Exercise Price Per Option, Cancelled	$ 10.21
Weighted Average Exercise Price Per Option, Balance December 31, 2013	$ 9.45
Weighted Average Exercise Price Per Option, Options Exercisable, December 31, 2013	$ 10.53
Weighted Average Remaining Contractual Term (Years), Options outstanding, December 31, 2013	4 years 1 month 24 days
Weighted Average Remaining Contractual Term (Years), Options Exercisable, December 31, 2013	3 years 4 months 24 days
Aggregate Intrinsic Value, Options outstanding, December 31, 2013	$ 115
Aggregate Intrinsic Value, Options Exercisable, December 31, 2013	$ 0

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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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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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-Name Accounting Standards Codification

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-Section 50

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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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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

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