v3.22.1

Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Deferred income tax assets |  |  |
Net operating loss carryforwards | $ 48,556 | $ 50,446 |
Stock-based compensation | 507 | 4,765 |
Intangible assets and other | 4,235 | 9,034 |
Net deferred income tax assets | 53,298 | 64,245 |
Less: |  |  |
Valuation allowance | $ (53,298) | $ (64,245) | $ (51,788)

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