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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 210,238 | $ 203,161 | $ 582,522 | $ 599,938
Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 128,078 | 115,765 | 340,302 | 355,501
IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 82,160 | 87,396 | 242,220 | 244,437
United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 109,558 | 86,056 | 262,141 | 267,326
Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 49,767 | 58,357 | 175,768 | 167,002
Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 38,240 | 45,129 | 106,478 | 127,503
Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 12,673 | 13,619 | 38,135 | 38,107
Product revenue |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 112,151 | 108,501 | 298,894 | 319,166
Product revenue | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 53,455 | 42,305 | 124,554 | 137,496
Product revenue | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 58,696 | 66,196 | 174,340 | 181,670
Product revenue | Sales to enterprise customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 40,002 | 32,044 | 115,912 | 97,163
Product revenue | Sales to service provider customers |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 72,149 | 76,457 | 182,982 | 222,003
Product revenue | Indirect sales through channel partner program |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 38,000 | 35,950 | 114,958 | 109,454
Product revenue | Direct sales |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 74,151 | 72,551 | 183,936 | 209,712
Product revenue | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 58,198 | 40,162 | 120,173 | 131,774
Product revenue | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 24,708 | 31,969 | 99,636 | 88,235
Product revenue | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 25,590 | 32,070 | 68,304 | 89,495
Product revenue | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 3,655 | 4,300 | 10,781 | 9,662
Service |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 98,087 | 94,660 | 283,628 | 280,772
Service revenue (maintenance) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 69,019 | 69,272 | 204,920 | 209,488
Service revenue (maintenance) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 53,595 | 55,004 | 159,454 | 164,848
Service revenue (maintenance) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 15,424 | 14,268 | 45,466 | 44,640
Service revenue (maintenance) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 33,670 | 33,454 | 99,156 | 100,417
Service revenue (maintenance) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 17,918 | 18,268 | 53,105 | 56,393
Service revenue (maintenance) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 10,262 | 10,016 | 30,262 | 29,552
Service revenue (maintenance) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 7,169 | 7,534 | 22,397 | 23,126
Service revenue (professional services) |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 29,068 | 25,388 | 78,708 | 71,284
Service revenue (professional services) | Cloud and Edge |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 21,028 | 18,456 | 56,294 | 53,157
Service revenue (professional services) | IP Optical Networks |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 8,040 | 6,932 | 22,414 | 18,127
Service revenue (professional services) | United States |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 17,690 | 12,440 | 42,812 | 35,135
Service revenue (professional services) | Europe, Middle East and Africa |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 7,141 | 8,120 | 23,027 | 22,374
Service revenue (professional services) | Asia Pacific |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | 2,388 | 3,043 | 7,912 | 8,456
Service revenue (professional services) | Other |  |  |  |
REVENUE RECOGNITION |  |  |  |
Total revenue | $ 1,849 | $ 1,785 | $ 4,957 | $ 5,319

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