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Income Taxes - Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes |  |  |
Income tax expense (benefit) at US statutory income tax rate | $ (11,624) | $ (5,182) | $ (30,746)
State income tax expense (benefit), net of federal benefit | (1,507) | (773) | (2,844)
Foreign rate differential | (15) | (304) | (179)
Change in fair value of warrants | 6,232 |  |
Goodwill impairment |  |  | 16,624
Global intangible low-taxed income ("GILTI") inclusion |  | 1,095 | 22
Transaction costs |  | 260 | 507
Other permanent differences | 323 | 78 | 136
Step-up on C Corp conversion |  |  | (1,578)
Change in valuation allowance | 7,319 | 632 | 513
Provision to return adjustments | (320) | (166) |
Effect of change in foreign tax rates | (552) | 1,181 |
Other | 255 | (189) |
Income tax expense (benefit) | $ 111 | $ (3,368) | $ (17,545)
Effective tax rate (as percentage) | (0.20%) | 13.60% | 12.00%

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