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Accrued Expenses and Other Current Liabilities - Summary of Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Accrued expenses $ 4,320 $ 9,537
Other current liabilities 1,871 9,249
Accrued compensation 6,746 7,111
Early exercised option deposit liability   4,074
Income taxes payable   3,705
Accrued expenses and other current liabilities $ 12,937 $ 33,676