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Summary of Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Type, Geographic Region and Customer (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue: |  |  |
Total revenue | $ 1,046,487 | $ 990,533 | $ 996,810
Percentage of total revenue | 100.00% | 100.00% | 100.00%
Broadband/Cable/Satellite |  |  |
Revenue: |  |  |
Percentage of total revenue | 57.00% | 58.00% | 58.00%
Telecommunications |  |  |
Revenue: |  |  |
Percentage of total revenue | 19.00% | 19.00% | 19.00%
Other |  |  |
Revenue: |  |  |
Percentage of total revenue | 24.00% | 23.00% | 23.00%
Americas (principally the U.S.) |  |  |
Revenue: |  |  |
Percentage of total revenue | 85.00% | 86.00% | 87.00%
Europe, Middle East and Africa |  |  |
Revenue: |  |  |
Percentage of total revenue | 11.00% | 10.00% | 9.00%
Asia Pacific |  |  |
Revenue: |  |  |
Percentage of total revenue | 4.00% | 4.00% | 4.00%
SaaS and Related Solutions |  |  |
Revenue: |  |  |
Total revenue | $ 926,290 | $ 880,822 | $ 896,164
Software and Services |  |  |
Revenue: |  |  |
Total revenue | 72,818 | 63,239 | 52,364
Maintenance |  |  |
Revenue: |  |  |
Total revenue | $ 47,379 | $ 46,472 | $ 48,282

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