XML 85 R73.htm IDEA: XBRL DOCUMENT v3.21.1
Income Taxes - Reconciliation of Federal Statutory Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Tax computed at federal statutory rate 21.00% 21.00%
State income taxes, net of federal tax benefit 7.20% (0.80%)
Other permanent items (0.10%) 1.60%
Tax rate adjustment (0.30%) 0.20%
Research and development credits 0.10% 0.10%
Stock-based compensation 1.30% (33.90%)
Other (0.20%) 0.20%
Valuation allowance (28.20%) 11.70%
Effective income tax rate 0.80% 0.10%