Summary of Significant Accounting Policies - Accounts and Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,486	$ 1,090
Charged to Revenue	7,742	3,414
Charged to Costs and Expenses	1,606	824
Write-offs	(10)	(239)
Utilization	(6,504)	(1,603)
Balance at End of Period	6,320	3,486
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	1,175	590
Charged to Costs and Expenses	1,606	824
Write-offs	(10)	(239)
Balance at End of Period	2,771	1,175
Allowance for service changes and cancellations
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	2,311	500
Charged to Revenue	7,742	3,414
Utilization	(6,504)	(1,603)
Balance at End of Period	$ 3,549	$ 2,311