Summary of Significant Accounting Policies - Allowance for Sales Credits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning Balance	$ 3,106	$ 539	$ 367
Additions	3,760	5,187	1,388
Deductions	(4,105)	(2,620)	(1,216)
Ending Balance	$ 2,761	$ 3,106	$ 539