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Leases - Summary of Operating Lease Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Lease, Cost [Abstract]    
Operating lease expense $ 347 $ 347
Variable lease expense 106 86
Total lease expense 453 433
Operating cash outflows from operating leases $ 421 $ 397