Stockholders' Equity - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 6 Months Ended | |||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
Senior Management Group
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Jun. 30, 2013
All Other Employees
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Jun. 30, 2013
Non Employee Awards
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Jun. 30, 2013
Time Based Vesting Schedule
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Jun. 30, 2013
Warrants
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Jun. 30, 2012
Warrants
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Jun. 30, 2013
Restricted Stock Units (RSUs)
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Jun. 30, 2013
Performance based Vesting Condition
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May 29, 2013
2011 Plan
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Jun. 30, 2013
Employee Stock Purchase Plan
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Jun. 30, 2013
Employee Stock Purchase Plan
Current Period One
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||
Increase in the aggregate number of shares of common stock authorized for issuance | 10,000,000 | ||||||||||||||
Aggregate intrinsic value | $ 1,800,000 | ||||||||||||||
Shares underlying stock options and restricted stock units awards with performance-based vesting criteria | 2,500,000 | ||||||||||||||
Expiration period | 10 years | ||||||||||||||
Options vesting period | 4 years | ||||||||||||||
Expected Dividend yield | 0.00% | ||||||||||||||
Expected Life (in year) | 6 years | 5 years 6 months | |||||||||||||
Recognized stock-based compensation expense | 1,900,000 | 3,900,000 | |||||||||||||
Stock-based compensation expense | 3,736,000 | 2,069,000 | 8,002,000 | 4,391,000 | 100,000 | ||||||||||
Total unrecognized compensation cost related to non-vested equity awards | $ 6,800,000 | $ 6,800,000 | $ 15,800,000 | ||||||||||||
Total unrecognized compensation cost, weighted-average vesting period | 2 years 7 months 28 days | ||||||||||||||
Shares reserved and approved for issuance | 996,000 | ||||||||||||||
Shares issued to employees | 761,222 | 62,498 | |||||||||||||
Shares remaining available for future purchases | 234,778 | ||||||||||||||
Warrants to purchase common stock | 12,500,000 | ||||||||||||||
Warrants exercised | 84,000 | 4,700,000 | |||||||||||||
Warrants exercisable per share | $ 1.96 |