Significant Accounting Policies - Transition Adjustment and Cash Collections on Remaining Contracts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	$ 258,615	$ 248,234	$ 299,255
Cost of sales	43,283	39,330	43,081
Gross Profit	215,332	208,904	256,174
Transition Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	0	0	21,385
Cost of sales	0	0	2,565
Collections on Remaining Contracts
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	1,038	7,767	8,219
Cost of sales	145	1,087	1,151
Net sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net sales	1,038	7,767	29,604
Write-off of cost of sales deemed uncollectible
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	29	0	1,438
Cost of sales
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cost of sales	174	1,087	5,154
Gross profit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gross Profit	$ 864	$ 6,680	$ 24,450