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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Allowance for Credit Losses |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | $ 50 | $ 129 | $ 168
Deductions Credited to Expenses or Other Accounts |  | (79) | (39)
Balance at End of Period | 50 | 50 | 129
Deferred Tax Valuation Allowance |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Period | 55,951 | 45,494 | 45,496
Additions Charged to Expenses or Other Accounts | 13,363 | 10,457 |
Deductions Credited to Expenses or Other Accounts |  |  | (2)
Balance at End of Period | $ 69,314 | $ 55,951 | $ 45,494

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- Definition Valuation allowances and reserves, additions, charged to expenses or other accounts. + References No definition available. + Details
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- Definition Valuation allowances and reserves, deductions, credited to expenses or other accounts. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + 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 B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: 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 E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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