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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accrued contract manufacturing costs $ 5,169 $ 1,414
Accrued facility-related costs 3,531 2,843
Accrued contract research costs 2,623 2,785
Accrued employee compensation costs 2,611 5,048
Accrued professional fees 1,606 1,235
Others 800 1,276
Total accrued expenses $ 16,340 $ 14,601