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Effective Income Tax Rate (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |
Federal tax benefit rate | 21.00% | 21.00%
Permanent items | (3.30%) | 1.00%
Tax law changes | (2.70%) | (0.70%)
Stock based compensation | (0.90%) | (6.50%)
Tax attribute expirations | (4.00%) | (1.60%)
Foreign withholding tax |  | (0.30%)
Valuation allowance | (10.10%) | (13.20%)
Effective income tax rate | 0.00% | (0.30%)

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