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Income Tax (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax |  |  |
Income tax benefit at the federal statutory rate | $ (9,928) | $ (7,903) | $ (8,052)
State tax benefit | (2,875) | (4,066) | (48)
Foreign tax differential | (96) | (185) | (900)
Stock-based compensation | 252 | 166 | 133
Interest Expense | 1,842 | 1,315 | 478
GILTI Inclusion | 0 | 0 | 849
Prior year true-ups | 140 | (770) | 1,493
Other | 497 | 258 | 166
Credits | (2,074) | (1,388) | 0
Valuation allowance | 12,114 | 11,597 | 5,212
Income tax expense | $ (128) | $ (976) | $ 1,131
Effective tax rate | 0.27% | 2.59% | (2.95%)

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