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Leases - Summary of Operating Lease Cost (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease, Cost [Abstract]        
Operating lease expense $ 347 $ 347 $ 694 $ 694
Variable lease expense 106 94 212 180
Total lease expense 453 441 906 874
Operating cash outflows from operating leases $ 413 $ 389 $ 834 $ 786