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REVENUE RECOGNITION - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 231,118 | $ 137,653 | $ 599,593 | $ 402,002
Product revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 128,926 | 61,152 | 325,687 | 180,691
Product revenue | Sales to enterprise customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 36,937 | 17,458 | 100,168 | 47,295
Product revenue | Sales to service provider customers |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 91,989 | 43,694 | 225,519 | 133,396
Product revenue | Indirect sales through channel partner program |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 36,586 | 21,537 | 97,839 | 69,380
Product revenue | Direct sales |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 92,340 | 39,615 | 227,848 | 111,311
Service revenue (maintenance) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 73,642 | 58,901 | 203,333 | 173,031
Service revenue (professional services) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 28,550 | 17,600 | 70,573 | 48,280
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 104,850 | 87,523 | 284,854 | 240,725
United States | Product revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 57,503 | 44,701 | 150,980 | 114,525
United States | Service revenue (maintenance) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 33,275 | 32,709 | 98,392 | 99,281
United States | Service revenue (professional services) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 14,072 | 10,113 | 35,482 | 26,919
Europe, Middle East and Africa |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 68,118 | 20,880 | 167,393 | 71,930
Europe, Middle East and Africa | Product revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 41,265 | 7,346 | 97,431 | 32,215
Europe, Middle East and Africa | Service revenue (maintenance) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 19,720 | 10,899 | 54,042 | 31,016
Europe, Middle East and Africa | Service revenue (professional services) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 7,133 | 2,635 | 15,920 | 8,699
Asia Pacific |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 39,624 | 15,859 | 99,789 | 51,236
Asia Pacific | Product revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 22,233 | 5,517 | 59,030 | 23,217
Asia Pacific | Service revenue (maintenance) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 12,208 | 7,123 | 26,742 | 20,272
Asia Pacific | Service revenue (professional services) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 5,183 | 3,219 | 14,017 | 7,747
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 18,526 | 13,391 | 47,557 | 38,111
Other | Product revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 7,925 | 3,588 | 18,246 | 10,734
Other | Service revenue (maintenance) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | 8,439 | 8,170 | 24,157 | 22,462
Other | Service revenue (professional services) |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenue | $ 2,162 | $ 1,633 | $ 5,154 | $ 4,915

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