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Accounts Payable & Other Current Liabilities - Summary of Accounts Payable and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accounts payable $ 2,270 $ 1,629
Accrued expenses and other liabilities:    
Employee benefits and compensation related accruals 2,347 3,085
General and administrative related accruals 1,966 2,389
Research and development related accruals 7,015 7,741
Accrued income taxes 0 1,721
Accounts payable and other accrued liabilities $ 13,598 $ 16,565