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Income Taxes (Income Tax Rate Reconciliation) (Detail)
12 Months Ended
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%)