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Income Taxes - Effective Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Amount |  |  |
Tax provision (benefit) at U.S. statutory rate | $ (23,431) | $ (3,804) | $ (2,209)
State income taxes | (739) | (409) | (127)
Foreign taxes in excess of the U.S. statutory rate | 10 | 74 | 202
Change of valuation allowance | 11,394 | 2,397 | 525
Change in fair value | 4,166 | 1,275 | 0
Share based compensation | 8,804 | 1,548 | 779
Attribute carryback | 0 | 0 | (203)
Tax credits | (3,615) | (862) | 0
Section 162(m) limitation | 3,693 | 0 | 0
Other | 45 | 167 | 230
Total Provision for income taxes | $ 327 | $ 386 | $ (803)
Percent |  |  |
Tax provision (benefit) at U.S. statutory rate | 21.00% | 21.00% | 21.00%
State income taxes | 0.60% | 2.30% | 1.20%
Foreign taxes in excess of the U.S. statutory rate | 0.00% | (0.40%) | (1.90%)
Change of valuation allowance | (10.20%) | (13.20%) | (5.00%)
Change in fair value | (3.70%) | (7.10%) | 0.00%
Share based compensation | (7.90%) | (8.60%) | (7.40%)
Attribute carryback | 0.00% | 0.00% | 1.90%
Tax credits | 3.20% | 4.80% | 0.00%
Section 162(m) limitation | (3.30%) | 0.00% | 0.00%
Other | 0.00% | (0.90%) | (2.20%)
Tax Expense | (0.30%) | (2.10%) | 7.60%

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