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Income Taxes - Significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Federal and state operating loss carryforwards $ 370 $ 19,904
Foreign operating loss carryforwards 176 324
Acquired intangibles 3,095 1,683
Stock-based compensation 467 276
Lease Liability   17
Capitalized R&D Costs 278 7,023
Other 16 44
Research and development credit carryforwards 26 1,483
Total deferred tax assets 4,428 30,754
Valuation allowance (4,400) (30,800)
Total deferred tax assets, net of valuation allowance   20
Deferred tax liabilities:    
ROU Asset   (18)
Other   (2)
Domestic    
Deferred tax assets:    
Valuation allowance (4,252) (30,410)
Foreign    
Deferred tax assets:    
Valuation allowance $ (176) $ (324)