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Income Taxes - Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
At statutory rate | $ (12,535) | $ 5,245 | $ 8,281
State taxes, net of U.S. federal benefit | (757) | (99) | 926
Foreign taxes | 0 | (223) | 223
Federal tax deductions | 357 | (5) | (1,248)
Change in applicable tax rate | 286 | 478 | 0
Provision to return permanent difference | 340 | (20) | 7
R&D credits | 67 | (159) | (29)
Fuel tax credit | (125) | (90) | (176)
Foreign tax credit | 0 | 153 | (175)
Foreign branch loss | 0 | 50 | 0
Gain on bargain purchase | 0 | (8,316) | 0
Unrecognized tax benefits | 2,163 | 0 | 0
NOL carryback/carryforward | 1,186 | (10,046) | 0
Other | 0 | 52 | 0
Total income tax (benefit) expense | $ (9,017) | $ (12,980) | $ 7,809

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(1)(Note 1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32639-109319 + Details
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