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Income Taxes - Reconciliation Of Income Tax Rates (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount |  |
Statutory rate | $ 964 | $ 2,936
Foreign tax rate differential | 20 | 65
State income taxes, net of federal benefit | 132 | 1,003
Non-deductible expenses | 153 | 181
Tax benefits related to disposition of the Test and Inspection Services business | (2,130) | (16,282)
U.S. taxation of foreign income, net of tax credits | 32 | 621
Income tax credits | (227) | (1,357)
Nondeductible executive compensation | 17 | 132
Change in income tax rates | 379 | 138
Tax on unremitted foreign earnings | (68) | 174
Change in valuation allowance | 1,807 | 731
Other | 40 | (183)
Total income tax expense | $ 1,119 | $ (11,841)
Effective Income Tax Rate Reconciliation, Percent |  |
Statutory rate | 21.00% | 21.00%
Foreign tax rate differential | 0.40% | 0.50%
State income taxes, net of federal benefit | 2.90% | 7.20%
Non-deductible expenses | 3.30% | 1.30%
Tax benefits related to disposition of the Test and Inspection Services business | (46.40%) | (116.40%)
U.S. taxation of foreign income, net of tax credits | 0.70% | 4.40%
Income tax credits | (4.90%) | (9.70%)
Nondeductible executive compensation | 0.40% | 0.90%
Change in income tax rates | 8.30% | 1.00%
Tax on unremitted foreign earnings | (1.50%) | 1.20%
Change in valuation allowance | 39.40% | 5.20%
Other | 0.90% | (1.30%)
Total income tax expense/ Effective rate | 24.40% | (84.70%)

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