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Reconciliation of Beginning and Ending Balances for Warrant Liability Using Significant Unobservable Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 20,390
Decrease in fair value of warrants (9,034)
Ending balance $ 11,356