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Leases - Summary of additional information regarding Company's Leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Lease cost:        
Operating lease cost $ 789 $ 874 $ 2,379 $ 2,474
Short-term lease cost 322 561 1,094 1,277
Total lease cost 1,111 $ 1,435 3,473 $ 3,751
Other information:        
Cash paid for amounts included in the measurement of operating liabilities (operating leases) $ 902   $ 2,662  
Weighted-average remaining lease term (in years) – operating leases 9 years 7 months 6 days   9 years 7 months 6 days  
Weighted-average discount rate – operating leases 6.30%   6.30%