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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
REVENUE RECOGNITION |  |  |
Total revenue | $ 844,556 | $ 833,881 | $ 826,339
United States |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 402,957 | 395,984 | 344,415
Europe, Middle East and Africa |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 214,151 | 234,679 | 261,901
Asia Pacific |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 180,985 | 151,570 | 167,083
Other |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 46,463 | 51,648 | 52,940
Product revenue |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 434,587 | 447,229 | 445,150
Product revenue | Cloud and Edge |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 198,163 | 211,001 | 184,730
Product revenue | IP Optical Networks |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 236,424 | 236,228 | 260,420
Product revenue | Sales to enterprise customers |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 148,758 | 176,064 | 143,853
Product revenue | Sales to service provider customers |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 285,829 | 271,165 | 301,297
Product revenue | Indirect sales through channel partner program |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 134,154 | 170,426 | 157,495
Product revenue | Direct sales |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 300,433 | 276,803 | 287,655
Product revenue | United States |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 179,660 | 201,340 | 161,945
Product revenue | Europe, Middle East and Africa |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 111,235 | 129,824 | 151,938
Product revenue | Asia Pacific |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 129,298 | 100,766 | 115,923
Product revenue | Other |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 14,394 | 15,299 | 15,344
Service |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 409,969 | 386,652 | 381,189
Service revenue (maintenance) |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 270,551 | 274,582 | 279,652
Service revenue (maintenance) | Cloud and Edge |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 206,604 | 212,988 | 219,939
Service revenue (maintenance) | IP Optical Networks |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 63,947 | 61,594 | 59,713
Service revenue (maintenance) | United States |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 136,452 | 133,182 | 133,737
Service revenue (maintenance) | Europe, Middle East and Africa |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 69,594 | 71,856 | 75,478
Service revenue (maintenance) | Asia Pacific |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 38,474 | 39,863 | 39,891
Service revenue (maintenance) | Other |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 26,031 | 29,681 | 30,546
Service revenue (professional services) |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 139,418 | 112,070 | 101,537
Service revenue (professional services) | Cloud and Edge |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 106,663 | 81,168 | 72,979
Service revenue (professional services) | IP Optical Networks |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 32,755 | 30,902 | 28,558
Service revenue (professional services) | United States |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 86,845 | 61,462 | 48,733
Service revenue (professional services) | Europe, Middle East and Africa |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 33,322 | 32,999 | 34,485
Service revenue (professional services) | Asia Pacific |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | 13,213 | 10,941 | 11,269
Service revenue (professional services) | Other |  |  |
REVENUE RECOGNITION |  |  |
Total revenue | $ 6,038 | $ 6,668 | $ 7,050

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