Summary of Significant Accounting Policies - Rollforward of Unbilled Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Beginning Balance	$ 37,785	$ 33,450
Recognized during the period	252,661	248,574
Reclassified to receivables	(254,482)	(244,574)
Other	(162)	335
Ending Balance	$ 35,802	$ 37,785