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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Total revenue	$ 295,143	$ 286,868	$ 880,596	$ 871,934
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%	53.00%	52.00%	53.00%
Telecommunications
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	18.00%	20.00%	18.00%	20.00%
Other
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	29.00%	27.00%	30.00%	27.00%
Americas (principally the U.S.)
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	88.00%	86.00%	88.00%	86.00%
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	9.00%	9.00%	8.00%	10.00%
Asia Pacific
Disaggregation Of Revenue [Line Items]
Percentage of total revenue	3.00%	5.00%	4.00%	4.00%
SaaS and Related Solutions
Disaggregation Of Revenue [Line Items]
Total revenue	$ 263,701	$ 250,777	$ 788,054	$ 764,253
Software and Services
Disaggregation Of Revenue [Line Items]
Total revenue	19,705	23,578	56,780	73,235
Maintenance
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,737	$ 12,513	$ 35,762	$ 34,446