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Employee Benefit Plan - Details of Company Contribution to Plan (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract]      
Company contribution to 401 (k) plan $ 172 $ 127 $ 106