Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

Summary of Changes in Deferred Revenue Related to Material Right Performance Obligations

Changes in deferred revenue related to material right performance obligations as of September 30, 2021 and 2020 were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Balance, beginning of period	$	92,458		$	80,887		$	86,826		$	76,244
Deferral of revenue		10,573			7,838			26,071			20,324
Recognition of unearned revenue		(5,154	)		(3,338	)		(15,020	)		(11,181	)
Balance, end of period	$	97,877		$	85,387		$	97,877		$	85,387

Summary of Asset Balances and Related Amortization Expense For Contract Costs

The following tables present the asset balances and related amortization expense for these contract costs:

	As of and for the Three Months Ended September 30, 2021
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	248,908	$	16,648	$	(9,469	)	$	256,087
Costs to fulfill a contract	$	229,512	$	24,652	$	(7,931	)	$	246,233
	As of and for the Three Months Ended September 30, 2020
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	209,462	$	12,174	$	(7,716	)	$	213,920
Costs to fulfill a contract	$	171,941	$	18,709	$	(5,889	)	$	184,761

	As of and for the Nine Months Ended September 30, 2021
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	232,583	$	50,890	$	(27,386	)	$	256,087
Costs to fulfill a contract	$	199,593	$	68,764	$	(22,124	)	$	246,233
	As of and for the Nine Months Ended September 30, 2020
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	194,964	$	41,340	$	(22,384	)	$	213,920
Costs to fulfill a contract	$	143,788	$	57,289	$	(16,316	)	$	184,761