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Leases - Summary of Cash Flow Information Related to Operating Leases (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating lease right-of-use asset $ 9,974 $ 10,864 $ 13,219
Accrued rent 819 877 835
Total operating lease right-of-use asset, net 9,155 9,987 12,384
Short-term operating lease liabilities 3,014 3,033 2,795
Long-term operating lease liabilities 6,960 7,831 10,424
Total operating lease liabilities 9,974 10,864 13,219
Cash paid for amounts included in the measurement of operating lease liabilities $ 871 $ 3,192 $ 2,500