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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Unrecognized tax benefits |  |  |
Balance at beginning of the year | $ 22,803 | $ 15,076 | $ 13,486
Net additions for tax positions - prior years | 505 | 4,987 | 230
Net additions for tax positions - current year | 3,489 | 3,355 | 2,339
Subtractions from tax positions - prior years | (327) | (74) | (537)
Subtractions from tax positions - current year | (654) | (541) | (442)
Balance at end of the year | 25,816 | 22,803 | 15,076
Amount that would impact the effective tax rate if uncertain tax benefits were recognized | 500 |  |
Accrued interest and penalties associated with uncertain tax positions | $ 0 | $ 0 | $ 0

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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- Definition Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319 + Details
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