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Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Tax Disclosure [Abstract] |  |
Federal tax benefit rate | 21.00% | 21.00%
Permanent items | (4.40%) | (6.10%)
Stock based compensation | 0.30% | (0.50%)
Tax attribute expirations | (5.90%) | (6.60%)
Foreign withholding tax | 0.00% | 0.40%
Valuation allowance | (11.20%) | (7.80%)
Other | 0.20% | 0.00%
Effective income tax rate | 0.00% | 0.40%

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