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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets [Abstract]    
Allowances and reserves $ 6 $ 270
Accrued expenses 283 122
Stock based compensation 657 996
Net operating loss carryforwards 92,659 91,197
Income tax credit carryforwards 8,749 8,671
Property and equipment, principally due to differences in depreciation 95 548
Intangible assets 370  
Other, net 217 38
Deferred tax assets (Total) 103,036 101,842
Valuation allowance (102,822) (101,091)
Total deferred tax assets, net of allowance 214 751
Deferred tax liabilities [Abstract]    
Other (214) (751)
Total deferred tax liability (214) (751)
Net deferred tax assets (liability) $ 0 $ 0