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Leases - Schedule of Quantitative Information for Company's Operating Leases (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating leases costs $ 119 $ 114 $ 268 $ 229