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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets [Abstract]    
Allowances and reserves $ 140 $ 573
Accrued expenses 154 701
Stock based compensation 1,065 1,947
Net operating loss carryforwards 87,426 125,182
Income tax credit carryforwards 8,587 7,764
Property and equipment, principally due to differences in depreciation 514 675
Other, net 45 48
Deferred tax assets (Total) 97,931 136,890
Valuation allowance (97,089) (134,873)
Total deferred tax assets, net of allowance 842 2,017
Deferred tax liabilities [Abstract]    
Intangibles assets (842) (2,017)
Total deferred tax liability (842) (2,017)
Net deferred tax assets (liability) $ 0 $ 0