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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets [Abstract]    
Accrued expenses $ 41 $ 128
Stock based compensation 164 168
Net operating loss carryforwards 95,310 95,114
Income tax credit carryforwards 8,864 8,756
Property and equipment, principally due to differences in depreciation 19 16
Intangible assets 451 556
Other, net 82 182
Deferred tax assets (Total) 104,931 104,920
Valuation allowance (104,857) (104,742)
Total deferred tax assets, net of allowance 74 178
Deferred tax liabilities [Abstract]    
Other (74) (178)
Total deferred tax liability (74) (178)
Net deferred tax assets (liability) $ 0 $ 0