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Income Taxes - Rollforward of Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Roll forward of valuation allowance: |  |  |
BALANCE AT BEGINNING OF THE YEAR | $ 46,938 |  |
BALANCE AT END OF THE YEAR | 51,744 | $ 46,938 |
Valuation Allowance of Deferred Tax Assets |  |  |
Roll forward of valuation allowance: |  |  |
BALANCE AT BEGINNING OF THE YEAR | 46,938 | 60,003 | $ 55,666
CHARGED (CREDITED) TO EXPENSE | 8,406 | (8,337) | 6,211
OTHER INCREASES/ (DECREASES) | (3,600) | (4,728) | (1,874)
BALANCE AT END OF THE YEAR | $ 51,744 | $ 46,938 | $ 60,003

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to accounts other than cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column C)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- Details
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