Revenue (Tables)

9 Months Ended

Sep. 30, 2020

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, 2020 and 2019 were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2020			2019			2020			2019
Balance, beginning of period	$	80,887		$	70,004		$	76,244		$	64,651
Deferral of revenue		7,838			6,631			20,324			17,651
Recognition of unearned revenue		(3,338	)		(3,270	)		(11,181	)		(8,937	)
Balance, end of period	$	85,387		$	73,365		$	85,387		$	73,365

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, 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 Three Months Ended September 30, 2019
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	178,445	$	11,315	$	(6,321	)	$	183,439
Costs to fulfill a contract	$	121,664	$	15,323	$	(4,258	)	$	132,729
	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
	As of and for the Nine Months Ended September 30, 2019
	Beginning		Capitalization					Ending
	Balance		of Costs		Amortization			Balance
Costs to obtain a contract	$	158,989	$	42,513	$	(18,063	)	$	183,439
Costs to fulfill a contract	$	101,756	$	42,614	$	(11,641	)	$	132,729