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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 819,760 | $ 844,957 | $ 843,795
Cloud and Edge |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 508,137 | 556,656 | 583,270
IP Optical Networks |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 311,623 | 288,301 | 260,525
Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 442,680 | 453,042 | 467,912
Product revenue | Cloud and Edge |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 215,770 | 248,570 | 275,445
Product revenue | IP Optical Networks |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 226,910 | 204,472 | 192,467
Product revenue | Sales to enterprise customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 125,664 | 111,494 | 138,469
Product revenue | Sales to service provider customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 317,016 | 341,548 | 329,443
Product revenue | Indirect sales through channel program |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 131,998 | 117,065 | 134,876
Product revenue | Direct sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 310,682 | 335,977 | 333,036
Service |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 377,080 | 391,915 | 375,883
Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 282,095 | 286,321 | 274,816
Service revenue (maintenance) | Cloud and Edge |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 222,238 | 228,321 | 229,035
Service revenue (maintenance) | IP Optical Networks |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 59,857 | 58,000 | 45,781
Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 94,985 | 105,594 | 101,067
Service revenue (professional services) | Cloud and Edge |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 70,130 | 79,765 | 78,790
Service revenue (professional services) | IP Optical Networks |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 24,855 | 25,829 | 22,277
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 352,663 | 376,037 | 382,619
United States | Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 175,189 | 196,058 | 201,347
United States | Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 132,655 | 132,683 | 132,661
United States | Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 44,819 | 47,296 | 48,611
Europe, Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 252,781 | 248,027 | 248,268
Europe, Middle East and Africa | Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 147,523 | 138,203 | 149,567
Europe, Middle East and Africa | Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 75,948 | 79,475 | 73,475
Europe, Middle East and Africa | Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 29,310 | 30,349 | 25,226
Asia Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 151,099 | 152,931 | 146,456
Asia Pacific | Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 95,828 | 92,803 | 90,201
Asia Pacific | Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 41,677 | 41,945 | 36,628
Asia Pacific | Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 13,594 | 18,183 | 19,627
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 63,217 | 67,962 | 66,452
Other | Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 24,140 | 25,978 | 26,797
Other | Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 31,815 | 32,218 | 32,052
Other | Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 7,262 | $ 9,766 | $ 7,603

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