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Accounts Payable & Other Current Liabilities - Summary of Accounts Payable and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accounts payable $ 2,120 $ 1,629
Accrued expenses and other liabilities:    
Employee benefits and compensation related accruals 3,109 3,085
General and administrative related accruals 1,955 2,389
Research and development related accruals 6,363 7,741
Accrued income taxes 0 1,721
Accounts payable and other accrued liabilities $ 13,547 $ 16,565