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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 563,111 | $ 577,905 | $ 329,942
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 341,293 | 337,624 | 219,057
Europe, Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 97,727 | 96,483 | 44,565
Japan |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 30,599 | 39,411 | 24,389
Asia/Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 38,537 | 47,254 | 22,546
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 54,955 | 57,133 | 19,385
Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 262,030 | 279,014 | 181,119
Product revenue |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 262,030 | 279,014 | 181,119
Product revenue | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 170,937 | 169,510 | 121,121
Product revenue | Europe, Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 42,262 | 37,833 | 23,352
Product revenue | Japan |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 13,065 | 23,108 | 10,252
Product revenue | Asia/Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 17,552 | 30,575 | 14,693
Product revenue | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 18,214 | 17,988 | 11,701
Service revenue (maintenance) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 234,228 | 233,966 | 114,735
Service revenue (maintenance) | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 133,271 | 132,282 | 75,040
Service revenue (maintenance) | Europe, Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 43,186 | 46,856 | 17,471
Service revenue (maintenance) | Japan |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 11,692 | 11,234 | 10,282
Service revenue (maintenance) | Asia/Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 16,106 | 12,321 | 5,901
Service revenue (maintenance) | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 29,973 | 31,273 | 6,041
Service revenue (professional services) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 66,853 | 64,925 | 34,088
Service revenue (professional services) | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 37,085 | 35,832 | 22,896
Service revenue (professional services) | Europe, Middle East and Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 12,279 | 11,794 | 3,742
Service revenue (professional services) | Japan |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 5,842 | 5,069 | 3,855
Service revenue (professional services) | Asia/Pacific |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 4,879 | 4,358 | 1,952
Service revenue (professional services) | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 6,768 | 7,872 | 1,643
Indirect sales through channel program | Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 94,639 | 69,232 | 43,138
Direct sales | Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 167,391 | 209,782 | 137,981
Sales to enterprise customers | Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | 70,548 | 57,534 | 35,592
Sales to service provider customers | Product |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue | $ 191,482 | $ 221,480 | $ 145,527

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