Revenue from Contracts with Customer - Deferred Contract Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Change in Deferred Contract Acquisition Costs [Roll Forward]
Balance at beginning of the period	$ 23,604	$ 14,851	$ 18,273	$ 11,610
Add: Contract costs capitalized during the period	6,032	3,307	17,032	9,936
Less: Amortization of contract costs during the period	(3,416)	(1,986)	(9,085)	(5,374)
Balance at end of the period	$ 26,220	$ 16,172	$ 26,220	$ 16,172