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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 215,371 | $ 210,238 | $ 617,233 | $ 582,522
United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 96,673 | 109,558 | 295,590 | 262,141
Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 62,892 | 49,767 | 160,504 | 175,768
Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 43,251 | 38,240 | 128,182 | 106,478
Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 12,555 | 12,673 | 32,957 | 38,135
Product revenue |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 109,979 | 112,151 | 307,027 | 298,894
Product revenue | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 46,097 | 53,455 | 134,070 | 124,554
Product revenue | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 63,882 | 58,696 | 172,957 | 174,340
Product revenue | Sales to enterprise customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 37,467 | 40,002 | 99,751 | 115,912
Product revenue | Sales to service provider customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 72,512 | 72,149 | 207,276 | 182,982
Product revenue | Indirect sales through channel partner program |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 28,488 | 38,000 | 90,211 | 114,958
Product revenue | Direct sales |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 81,491 | 74,151 | 216,816 | 183,936
Product revenue | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 39,515 | 58,198 | 127,957 | 120,173
Product revenue | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 35,765 | 24,708 | 80,759 | 99,636
Product revenue | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 30,337 | 25,590 | 89,342 | 68,304
Product revenue | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 4,362 | 3,655 | 8,969 | 10,781
Service |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 105,392 | 98,087 | 310,206 | 283,628
Service revenue (maintenance) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 69,515 | 69,019 | 204,234 | 204,920
Service revenue (maintenance) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 52,315 | 53,595 | 154,899 | 159,454
Service revenue (maintenance) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 17,200 | 15,424 | 49,335 | 45,466
Service revenue (maintenance) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 35,191 | 33,670 | 102,061 | 99,156
Service revenue (maintenance) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 18,045 | 17,918 | 53,790 | 53,105
Service revenue (maintenance) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 9,723 | 10,262 | 28,831 | 30,262
Service revenue (maintenance) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 6,556 | 7,169 | 19,552 | 22,397
Service revenue (professional services) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 35,877 | 29,068 | 105,972 | 78,708
Service revenue (professional services) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 26,026 | 21,028 | 80,108 | 56,294
Service revenue (professional services) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 9,851 | 8,040 | 25,864 | 22,414
Service revenue (professional services) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 21,967 | 17,690 | 65,572 | 42,812
Service revenue (professional services) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 9,082 | 7,141 | 25,955 | 23,027
Service revenue (professional services) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 3,191 | 2,388 | 10,009 | 7,912
Service revenue (professional services) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 1,637 | $ 1,849 | $ 4,436 | $ 4,957

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