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Effective Income Tax Rate (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Federal tax benefit rate 21.00% 21.00%
Permanent items (6.10%) (3.30%)
Tax law changes   (2.70%)
Stock based compensation (0.50%) (0.90%)
Tax attribute expirations (6.60%) (4.00%)
Foreign withholding tax 0.40%  
Valuation allowance (7.80%) (10.10%)
Effective income tax rate 0.40% 0.00%