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Fair Value Measurements - Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Debt Instrument Fair Value Carrying Value [Abstract]  
Beginning balance $ 12,237
Issuance of warrants 544
Excess of fair value of warrants over proceeds 362
Adjustment to fair value (3,145)
Ending balance $ 9,998