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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts receivable allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 153 $ 56 $ 229
Provision (Release) for Bad Debts 57 191 (79)
Net Write-offs (57) (94) (94)
Balance at End of Year 153 153 56
Refund reserve      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 1,515 554 396
Provision (Release) for Bad Debts 58,553 44,171 24,987
Net Write-offs (58,676) (43,210) (24,829)
Balance at End of Year $ 1,392 $ 1,515 $ 554