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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets [Abstract]    
Allowances and reserves   $ 6
Accrued expenses $ 128 283
Stock based compensation 168 657
Net operating loss carryforwards 95,114 92,659
Income tax credit carryforwards 8,756 8,749
Property and equipment, principally due to differences in depreciation 16 95
Intangible assets 556 370
Other, net 182 217
Deferred tax assets (Total) 104,920 103,036
Valuation allowance (104,742) (102,822)
Total deferred tax assets, net of allowance 178 214
Deferred tax liabilities [Abstract]    
Other (178) (214)
Total deferred tax liability (178) (214)
Net deferred tax assets (liability) $ 0 $ 0