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Income Taxes - Net deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss carryforwards $ 48,520 $ 44,142
Charitable contribution carryforwards 443 433
Research and experimentation credits 2,420 1,860
Capitalized intangibles 387 416
Stock-based compensation 152 116
Accrued compensation 196 22
Lease liabilities 119 111
Total deferred tax assets 52,237 47,100
Valuation allowance (52,118) (46,990)
Deferred tax assets, net of valuation allowance 119 110
Deferred tax liabilities:    
Right-of-use asset (107) (105)
Depreciation and amortization (12) (5)
Net deferred tax liability $ 0 $ 0