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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

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