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Income Taxes - Table 3 (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]          
U.S. federal statutory tax rate     $ (3,340) $ (4,108) $ (424)
State and local income taxes, net     (519) 80 83
Stock-based compensation     6,770 2,748 219
Change in valuation allowance     (3,216) 1,516 2,561
Foreign operations     1,575 (375) (433)
True-up adjustments     (538) 497 (167)
Permanent differences     65 157 114
Other, net     265 99 (23)
Total $ (1,039) $ (167) $ 1,062 $ 614 $ 1,930