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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 173,198 | $ 192,772
Cloud and Edge |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 109,806 | 125,422
IP Optical Networks |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 63,392 | 67,350
Product revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 81,990 | 97,889
Product revenue | Cloud and Edge |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 37,635 | 50,152
Product revenue | IP Optical Networks |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 44,355 | 47,737
Product revenue | Sales to enterprise customers |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 22,083 | 22,668
Product revenue | Sales to service provider customers |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 59,907 | 75,221
Product revenue | Indirect sales through channel partner program |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 23,500 | 20,163
Product revenue | Direct sales |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 58,490 | 77,726
Service |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 91,208 | 94,883
Service revenue (maintenance) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 68,605 | 68,705
Service revenue (maintenance) | Cloud and Edge |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 55,030 | 54,673
Service revenue (maintenance) | IP Optical Networks |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 13,575 | 14,032
Service revenue (professional services) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 22,603 | 26,178
Service revenue (professional services) | Cloud and Edge |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 17,141 | 20,597
Service revenue (professional services) | IP Optical Networks |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 5,462 | 5,581
United States |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 75,649 | 79,580
United States | Product revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 31,940 | 36,812
United States | Service revenue (maintenance) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 33,064 | 31,606
United States | Service revenue (professional services) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 10,645 | 11,162
Europe, Middle East and Africa |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 48,963 | 54,773
Europe, Middle East and Africa | Product revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 24,410 | 28,208
Europe, Middle East and Africa | Service revenue (maintenance) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 17,742 | 19,655
Europe, Middle East and Africa | Service revenue (professional services) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 6,811 | 6,910
Asia Pacific |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 36,262 | 41,133
Asia Pacific | Product revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 22,390 | 25,582
Asia Pacific | Service revenue (maintenance) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 10,425 | 9,748
Asia Pacific | Service revenue (professional services) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 3,447 | 5,803
Other |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 12,324 | 17,286
Other | Product revenue |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 3,250 | 7,287
Other | Service revenue (maintenance) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | 7,374 | 7,696
Other | Service revenue (professional services) |  |
Disaggregation of Revenue [Line Items] |  |
Total revenue | $ 1,700 | $ 2,303

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