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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%

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