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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accrued compensation $ 3,642 $ 1,124
Accrued contracted research and development costs 2,484 410
Accrued professional fees 320 109
Accrued other 140 65
Total $ 6,586 $ 1,708