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Income Taxes - Schedule of (Provision for) Benefit from Income Taxes Differs from Federal Statutory Rate to the Loss Before Taxes (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Federal statutory income tax rate, percent 21.00% 21.00% 21.00%
Other permanent differences (0.50%) (0.10%) (0.10%)
State income taxes 6.10% 5.10% 3.80%
Foreign rate differential 0.00% 0.00% 0.20%
Foreign loss 0.00% (0.20%) (2.20%)
Federal benefit from NOL carryback 6.70% 0.00% 0.00%
Change in valuation allowance (25.80%) (27.70%) (20.00%)
Change in fair value of redeemable convertible preferred stock tranche liability and TRDF liability (0.50%) 1.70% 8.70%
Stock-based compensation 0.10% 0.10% (6.00%)
Benefit from (provision for) income taxes 7.10% (0.10%) 5.40%