Revenue Recognition - Changes in Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue From Contract With Customer [Abstract]
Deferred revenue, Balance at Beginning of Period	$ 3,740	$ 3,933
Deferred revenue, Billings	1,221	1,435
Deferred revenue, Revenue Recognized	(1,661)	(1,825)
Deferred revenue, Balance at End of Period	$ 3,300	$ 3,543