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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Allowance for doubtful accounts |  |
Changes in valuation and qualifying accounts |  |
Balance at Beginning of Period | $ 343 | $ 401
Charges to Costs and Expenses | 817 | 75
Additions/(Deductions) | (792) | (133)
Balance at End of Period | 368 | 343
Allowance for tax valuation |  |
Changes in valuation and qualifying accounts |  |
Balance at Beginning of Period | 3,989 | 4,209
Charges to Costs and Expenses | 517 | (141)
Additions/(Deductions) | (799) | (79)
Balance at End of Period | $ 3,707 | $ 3,989

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- Definition Amount of increase (decrease) in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset or that reflect a liability established to represent expected future costs, from charges to costs and expenses + References No definition available. + 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 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in 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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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