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Income Taxes (Income Tax Rate Reconciliation) (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective income tax rate continuing operations tax rate reconciliation [Abstract] |  |  |
Federal income tax computed at the statutory rate | 21.00% | 21.00% | 35.00%
Increase (reduction) in taxes resulting from: [Abstract] |  |  |
Tax reform/change in tax rate | 0.00% | 0.00% | (71.40%)
Mark-to-market on warrants | 0.00% | (0.70%) | 1.40%
Change in valuation allowance | (20.70%) | (20.90%) | (116.90%)
State income tax, net of federal benefit | (0.40%) | 0.00% | 0.00%
Deferred inventory adjustments | 0.00% | (1.00%) | 0.80%
Foreign taxes | 0.00% | 0.00% | 8.20%
Other | (0.50%) | 1.60% | 0.10%
Effective tax rate | (0.60%) | 0.00% | (142.80%)

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