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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 273,308 | $ 263,209 | $ 799,876 | $ 771,462
Percentage of total revenue | 100.00% | 100.00% | 100.00% | 100.00%
Broadband/Cable/Satellite |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 55.00% | 56.00% | 55.00% | 57.00%
Telecommunications |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 20.00% | 20.00% | 19.00% | 19.00%
Other |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 25.00% | 24.00% | 26.00% | 24.00%
Americas (principally the U.S.) |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 86.00% | 85.00% | 85.00% | 85.00%
Europe, Middle East and Africa |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 10.00% | 12.00% | 11.00% | 11.00%
Asia Pacific |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Percentage of total revenue | 4.00% | 3.00% | 4.00% | 4.00%
SaaS and Related Solutions |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 238,614 | $ 231,418 | $ 704,303 | $ 686,685
Software and Services |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | 23,123 | 19,518 | 61,627 | 49,330
Maintenance |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total revenue | $ 11,571 | $ 12,273 | $ 33,946 | $ 35,447

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