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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts receivable allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 153 $ 153 $ 56
Provision (Release) for Bad Debts 387 57 191
Net Write-offs (146) (57) (94)
Balance at End of Year 394 153 153
Refund reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1,392 1,515 554
Provision (Release) for Bad Debts 21,129 58,553 44,171
Net Write-offs (21,022) (58,676) (43,210)
Balance at End of Year $ 1,499 $ 1,392 $ 1,515