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Leases - Components of Lease Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 1,328 $ 1,284 $ 3,854 $ 3,869
Short-term lease cost 57 67 180 195
Variable lease cost 8 (1) 5 6
Sublease income 0 (33) (24) (102)
Total lease cost $ 1,393 $ 1,317 $ 4,015 $ 3,968