Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Total revenue	$ 286,868	$ 273,308	$ 871,934	$ 799,876
Percentage of total revenue	100.00%	100.00%	100.00%	100.00%
Broadband/Cable/Satellite
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	53.00%	55.00%	53.00%	55.00%
Telecommunications
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	20.00%	20.00%	20.00%	19.00%
Other
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	27.00%	25.00%	27.00%	26.00%
Americas (principally the U.S.)
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	86.00%	86.00%	86.00%	85.00%
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	9.00%	10.00%	10.00%	11.00%
Asia Pacific
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	5.00%	4.00%	4.00%	4.00%
SaaS and Related Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	$ 250,777	$ 238,614	$ 764,253	$ 704,303
Software and Services
Disaggregation Of Revenue [Line Items]
Total revenue	23,578	23,123	73,235	61,627
Maintenance
Disaggregation Of Revenue [Line Items]
Total revenue	$ 12,513	$ 11,571	$ 34,446	$ 33,946