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Income Taxes - Tax Effects (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income (loss) before income taxes |  |  |
United States | $ 116,380 | $ 51,934 | $ 18,148
Foreign | 4,048 | 3,952 | 2,774
Income before income taxes | 120,428 | 55,886 | 20,922
Current: |  |  |
State | 82 | 157 | 5
Foreign | 1,439 | 1,062 | 579
Total current | 1,521 | 1,219 | 584
Deferred: |  |  |
Federal | 20,521 | 4,594 | 3,962
State | 406 | 295 | (855)
Foreign | (670) | (204) | 197
Total deferred | 20,257 | 4,685 | 3,304
Income tax provision | 21,778 | 5,904 | 3,888
Reconciliation of income taxes at the United States Federal statutory rate to the effective income tax rate |  |  |
Income taxes at the United States statutory rate | 25,290 | 11,736 | 4,393
State income taxes | 387 | 226 | 78
Unrecognized tax benefits | (222) |  | (251)
Effect of change in valuation allowance | (1,443) | 806 | 1,492
Foreign income tax rate differentials | 152 | 181 | 129
Stock based compensation | (3,658) | (2,803) | (1,257)
Credit expirations | 2,342 | (14) | 894
Rate change | 159 | 151 | 194
Credit generation | (3,096) | (2,473) | (3,124)
Discrete items, net | 72 | (147) | 18
Previously unrecognized tax benefit |  | (4,063) |
GILTI inclusion | 301 | 732 | 566
Other, net | 1,494 | 1,572 | 756
Income tax provision | 21,778 | 5,904 | $ 3,888
Deferred tax assets: |  |  |
Federal net operating loss carryforwards | 5,635 | 23,193 |
State net operating loss carryforwards | 727 | 969 |
Foreign net operating loss carryforwards | 371 | 529 |
Federal tax credit carryforwards | 18,840 | 19,377 |
State tax credit carryforwards | 8,138 | 7,358 |
Property, plant and equipment | 8,967 | 9,501 |
Operating lease liability | 792 | 348 |
Accrued compensation | 280 | 16 |
Inventories | 1,729 | 2,271 |
Stock compensation | 1,401 | 1,566 |
Warranty | 1,471 | 982 |
Deferred revenue | 836 | 1,032 |
Capitalized research and development costs |  | 5,785 |
Gross deferred tax assets | 49,187 | 72,927 |
Valuation allowance | (7,689) | (9,133) |
Net deferred tax assets | 41,498 | 63,794 |
Deferred tax liabilities: |  |  |
Intangible assets | (72) | (80) |
Right-of-use asset | (4,918) | (4,756) |
Other | (1,054) | (1,107) |
Gross deferred tax liabilities | (6,044) | (5,943) |
Deferred taxes, net | 35,454 | $ 57,851 |
Decrease in valuation allowance | $ 1,400 |  |

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