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Reconciliation of Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
6 Months Ended |
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Jun. 30, 2013
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Change in the fair value of common stock warrant liability | $ 690 |
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Common stock warrants
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | |
| Issuance of common stock warrants | 4,392 |
| Change in the fair value of common stock warrant liability | (690) |
| Fair value of liability, Ending Balance | $ 3,702 |