Description of Business and Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019	Dec. 31, 2019 Customer
Description Of Business And Accounting Policies [Line Items]
Number of customers, exceeds 10% of total accounts receivable | Customer	1		1		1
Revenue derived from foreign operations	5.00%	5.00%	5.00%	5.00%
Deferred tax assets, valuation allowance released			$ 14.5
Tax effect of nondeductible transaction costs			7.1
Released amount of sales and use tax reserve	$ 2.0		$ 4.3
Verizon Communications Inc. [Member]
Description Of Business And Accounting Policies [Line Items]
Accounts receivable from one customer greater than 10%, percentage	14.00%		14.00%		25.00%