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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets [Abstract]    
Allowances and reserves $ 270 $ 140
Accrued expenses 122 154
Stock based compensation 996 1,065
Net operating loss carryforwards 91,197 87,426
Income tax credit carryforwards 8,671 8,587
Property and equipment, principally due to differences in depreciation 548 514
Other, net 38 45
Deferred tax assets (Total) 101,842 97,931
Valuation allowance (101,091) (97,089)
Total deferred tax assets, net of allowance 751 842
Deferred tax liabilities [Abstract]    
Intangibles assets (751) (842)
Total deferred tax liability (751) (842)
Net deferred tax assets (liability) $ 0 $ 0