Significant Accounting Policies - Accounts and Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 6,320	$ 3,486
Charged to Revenue	4,453	7,742
Charged to Costs and Expenses	1,257	1,606
Write-offs	(4)	(10)
Utilization	(3,549)	(6,504)
Balance at End of Period	8,477	6,320
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	2,771	1,175
Charged to Costs and Expenses	1,257	1,606
Write-offs	(4)	(10)
Balance at End of Period	4,024	2,771
Allowance for service changes and cancellations
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3,549	2,311
Charged to Revenue	4,453	7,742
Utilization	(3,549)	(6,504)
Balance at End of Period	$ 4,453	$ 3,549