Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounts receivable allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 394	$ 153	$ 153
Provision for Bad Debts	58	387	57
Net Write-offs	(76)	(146)	(57)
Balance at End of Year	376	394	153
Refund reserve
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,499	1,392	1,515
Provision for Bad Debts	9,724	21,129	58,553
Net Write-offs	(9,685)	(21,022)	(58,676)
Balance at End of Year	$ 1,538	$ 1,499	$ 1,392