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Schedule II (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Credit Loss |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | $ 41 | $ 50 | $ 25
(Recovered)/ Charged to Costs & Expenses | 51 | 27 | 4
Charged to Other Accounts | 0 | 0 | 36
Deductions | 2 | 36 | 15
Balance at End of Year | 90 | 41 | 50
SEC Schedule, 12-09, Allowance, Chargebacks |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Year | 179 | 476 | 2,344
(Recovered)/ Charged to Costs & Expenses | 83 | 291 | 1,316
Charged to Other Accounts | 0 | 0 | 0
Deductions | 40 | 588 | 3,184
Balance at End of Year | $ 222 | $ 179 | $ 476

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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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