Stockholders' Equity - Additional Information (Detail) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria	8,625,000
Expiration period	10 years
Options vesting period	4 years
Expected Dividend yield	0.00%
Recognized stock-based compensation expense	$ 2,100,000
Stock-based compensation expense	4,266,000	2,322,000
Total unrecognized compensation cost related to non-vested equity awards	6,800,000
Senior Management Group
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Life (in year)	6 years
All Other Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Life (in year)	5 years 6 months
Performance based Vesting Condition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria	2,600,000
Time Based Vesting Schedule
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to non-vested equity awards	16,600,000
Total unrecognized compensation cost, weighted-average vesting period	2 years 9 months
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase common stock	12,700,000
Warrants exercised	0	1,300,000
Warrants exercisable per share	$ 1.96
Restricted Stock Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value	$ 3,800,000
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved and approved for issuance	996,000
Shares issued to employees	761,222
Shares remaining available for future purchases	234,778
Employee Stock Purchase Plan \| Current Period One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued to employees	62,498

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Number Of Warrants Exercised During Period

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Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Aggregate Intrinsic Value

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Share Based Compensation Arrangement by Share Based Payment Award, Expiration Term

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate amount of each class of warrants or rights outstanding.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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