Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation Of Revenue [Line Items]
Total revenue	$ 286,327	$ 262,168	$ 585,066	$ 526,568
Percentage of total revenue	100.00%	100.00%	100.00%	100.00%
Broadband/Cable/Satellite
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	54.00%	55.00%	53.00%	54.00%
Telecommunications
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	18.00%	19.00%	19.00%	20.00%
Other
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	28.00%	26.00%	28.00%	26.00%
Americas (principally the U.S.)
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	87.00%	85.00%	85.00%	85.00%
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	9.00%	11.00%	11.00%	11.00%
Asia Pacific
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	4.00%	4.00%	4.00%	4.00%
SaaS and Related Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	$ 255,600	$ 230,712	$ 513,476	$ 465,689
Software and Services
Disaggregation Of Revenue [Line Items]
Total revenue	18,766	20,068	49,657	38,504
Maintenance
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,961	$ 11,388	$ 21,933	$ 22,375