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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]        
Operating leases expenses $ 1,203 $ 906 $ 3,221 $ 2,529
Standby letter of credit $ 1,384   $ 1,384