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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,284 $ 1,306 $ 3,869 $ 3,924
Short-term lease cost 67 65 195 194
Variable lease cost (1) (13) 6 (33)
Sublease income (33) (32) (102) (98)
Total lease cost $ 1,317 $ 1,326 $ 3,968 $ 3,987