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Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 264,400 | $ 253,119
Percentage of total revenue | 100.00% | 100.00%
Broadband/Cable/Satellite |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 54.00% | 57.00%
Telecommunications |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 19.00% | 18.00%
Other |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 27.00% | 25.00%
Americas (principally the U.S.) |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 84.00% | 86.00%
Europe, Middle East and Africa |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 12.00% | 10.00%
Asia Pacific |  |
Disaggregation Of Revenue [Line Items] |  |
Percentage of total revenue | 4.00% | 4.00%
SaaS and Related Solutions |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 234,977 | $ 227,019
Software and Services |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | 18,436 | 14,779
Maintenance |  |
Disaggregation Of Revenue [Line Items] |  |
Total revenue | $ 10,987 | $ 11,321

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