Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Reconciliation of Warrant Liability Measured at Fair Value (Detail)

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Stockholders' Equity (Deficit) - Reconciliation of Warrant Liability Measured at Fair Value (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Equity [Abstract]    
Beginning Balance   $ 23,421
Change in fair value of common stock warrants   (7,781)
Exercise of warrants (9,076) (9,076)
Ending Balance $ 6,564 $ 6,564