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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
REVENUE RECOGNITION |  |
Total revenue | $ 162,606 | $ 181,279
United States |  |
REVENUE RECOGNITION |  |
Total revenue | 72,578 | 82,695
Europe, Middle East and Africa |  |
REVENUE RECOGNITION |  |
Total revenue | 39,070 | 45,499
Asia Pacific |  |
REVENUE RECOGNITION |  |
Total revenue | 40,927 | 43,179
Other |  |
REVENUE RECOGNITION |  |
Total revenue | 10,031 | 9,906
Product revenue |  |
REVENUE RECOGNITION |  |
Total revenue | 68,114 | 81,991
Product revenue | Cloud and Edge |  |
REVENUE RECOGNITION |  |
Total revenue | 26,259 | 31,861
Product revenue | IP Optical Networks |  |
REVENUE RECOGNITION |  |
Total revenue | 41,855 | 50,130
Product revenue | Sales to enterprise customers |  |
REVENUE RECOGNITION |  |
Total revenue | 21,516 | 23,232
Product revenue | Sales to service provider customers |  |
REVENUE RECOGNITION |  |
Total revenue | 46,598 | 58,759
Product revenue | Indirect sales through channel partner program |  |
REVENUE RECOGNITION |  |
Total revenue | 19,329 | 22,735
Product revenue | Direct sales |  |
REVENUE RECOGNITION |  |
Total revenue | 48,785 | 59,256
Product revenue | United States |  |
REVENUE RECOGNITION |  |
Total revenue | 20,941 | 29,341
Product revenue | Europe, Middle East and Africa |  |
REVENUE RECOGNITION |  |
Total revenue | 16,962 | 19,460
Product revenue | Asia Pacific |  |
REVENUE RECOGNITION |  |
Total revenue | 27,934 | 31,039
Product revenue | Other |  |
REVENUE RECOGNITION |  |
Total revenue | 2,277 | 2,151
Service |  |
REVENUE RECOGNITION |  |
Total revenue | 94,492 | 99,288
Service revenue (maintenance) |  |
REVENUE RECOGNITION |  |
Total revenue | 63,667 | 66,422
Service revenue (maintenance) | Cloud and Edge |  |
REVENUE RECOGNITION |  |
Total revenue | 50,232 | 50,768
Service revenue (maintenance) | IP Optical Networks |  |
REVENUE RECOGNITION |  |
Total revenue | 13,435 | 15,654
Service revenue (maintenance) | United States |  |
REVENUE RECOGNITION |  |
Total revenue | 33,733 | 33,324
Service revenue (maintenance) | Europe, Middle East and Africa |  |
REVENUE RECOGNITION |  |
Total revenue | 14,683 | 17,383
Service revenue (maintenance) | Asia Pacific |  |
REVENUE RECOGNITION |  |
Total revenue | 9,230 | 9,400
Service revenue (maintenance) | Other |  |
REVENUE RECOGNITION |  |
Total revenue | 6,021 | 6,315
Service revenue (professional services) |  |
REVENUE RECOGNITION |  |
Total revenue | 30,825 | 32,866
Service revenue (professional services) | Cloud and Edge |  |
REVENUE RECOGNITION |  |
Total revenue | 23,021 | 24,962
Service revenue (professional services) | IP Optical Networks |  |
REVENUE RECOGNITION |  |
Total revenue | 7,804 | 7,904
Service revenue (professional services) | United States |  |
REVENUE RECOGNITION |  |
Total revenue | 17,904 | 20,030
Service revenue (professional services) | Europe, Middle East and Africa |  |
REVENUE RECOGNITION |  |
Total revenue | 7,425 | 8,656
Service revenue (professional services) | Asia Pacific |  |
REVENUE RECOGNITION |  |
Total revenue | 3,763 | 2,740
Service revenue (professional services) | Other |  |
REVENUE RECOGNITION |  |
Total revenue | $ 1,733 | $ 1,440

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