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THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES - Adoption Impact of ASC 606 (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
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Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Apr. 01, 2018
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs | $ 15,601 |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 15,601 | $ 0 |  | $ 11,234
Other current assets | 15,127 |  |  |  | 10,040 |  |  |  |  |  |  |  | 15,127 | 10,040 |  | 11,765
Non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs, non-current | 33,693 |  |  |  | 0 |  |  |  |  |  |  |  | 33,693 | 0 |  | 26,942
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | (250,302) |  |  |  | (201,464) |  |  |  |  |  |  |  | (250,302) | (201,464) |  | (161,563)
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue | 93,767 | $ 89,912 | $ 85,682 | $ 83,225 | 79,344 | $ 75,575 | $ 72,483 | $ 69,098 | $ 66,489 | $ 63,676 | $ 63,183 | $ 60,041 | 352,586 | 296,500 | $ 253,388 |
Sales and marketing | 49,525 | 46,276 | 41,680 | 40,495 | 40,422 | 36,382 | 28,680 | 28,460 | 27,351 | 25,770 | 24,328 | 21,444 | 177,976 | 133,945 | 98,893 |
Loss from operations | (28,780) | (24,238) | (21,987) | (15,983) | (13,730) | (18,247) | (4,462) | (5,457) | $ (3,685) | $ (1,703) | $ (379) | $ (901) | (90,988) | (41,896) | (6,669) |
Net loss | $ (28,131) | $ (23,771) | $ (21,482) | $ (15,355) | $ (13,262) | $ (88,520) | $ (546) | $ (2,169) |  |  |  |  | $ (88,739) | $ (104,497) | $ (4,751) |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in dollars per share) | $ (0.29) | $ (0.25) | $ (0.23) | $ (0.16) | $ (0.14) | $ (0.96) | $ (0.01) | $ (0.02) |  |  |  |  | $ (0.94) | $ (1.14) | $ (0.05) |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (28,131) | $ (23,771) | $ (21,482) | $ (15,355) | $ (13,262) | $ (88,520) | $ (546) | $ (2,169) |  |  |  |  | $ (88,739) | $ (104,497) | $ (4,751) |
Amortization of deferred sales commission costs |  |  |  |  |  |  |  |  |  |  |  |  | 14,204 | 0 | 0 |
Deferred sales commission costs |  |  |  |  |  |  |  |  |  |  |  |  | (25,286) | 0 | 0 |
Other current and non-current assets |  |  |  |  |  |  |  |  |  |  |  |  | (4,337) | (3,149) | (2,515) |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | (14,868) | 22,041 | 28,478 |
Service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 334,438 | 280,430 | 235,816 |
Product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 18,148 | 16,070 | $ 17,572 |
ASC 605 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |  |
Other current assets | 9,410 |  |  |  | 10,040 |  |  |  |  |  |  |  | 9,410 | 10,040 |  |
Non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs, non-current | 0 |  |  |  | 0 |  |  |  |  |  |  |  | 0 | 0 |  |
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | (305,313) |  |  |  | $ (201,464) |  |  |  |  |  |  |  | (305,313) | $ (201,464) |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 351,942 |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  | 189,058 |  |  |
Loss from operations |  |  |  |  |  |  |  |  |  |  |  |  | (102,714) |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  | $ (100,465) |  |  |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ (1.06) |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  | $ (100,465) |  |  |
Amortization of deferred sales commission costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Deferred sales commission costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other current and non-current assets |  |  |  |  |  |  |  |  |  |  |  |  | (3,693) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | (14,868) |  |  |
ASC 605 | Service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 335,671 |  |  |
ASC 605 | Product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 16,271 |  |  |
Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs | 15,601 |  |  |  |  |  |  |  |  |  |  |  | 15,601 |  |  | 11,234
Other current assets | 5,717 |  |  |  |  |  |  |  |  |  |  |  | 5,717 |  |  | 1,725
Non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred sales commission costs, non-current | 33,693 |  |  |  |  |  |  |  |  |  |  |  | 33,693 |  |  | 26,942
Stockholders' equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 55,011 |  |  |  |  |  |  |  |  |  |  |  | 55,011 |  |  | $ 39,901
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | 644 |  |  |
Sales and marketing |  |  |  |  |  |  |  |  |  |  |  |  | (11,082) |  |  |
Loss from operations |  |  |  |  |  |  |  |  |  |  |  |  | 11,726 |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,726 |  |  |
Net loss per share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.12 |  |  |
Statement of Cash Flows [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,726 |  |  |
Deferred sales commission costs |  |  |  |  |  |  |  |  |  |  |  |  | (25,286) |  |  |
Other current and non-current assets |  |  |  |  |  |  |  |  |  |  |  |  | (644) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Adjustments | Accounting Standards Update 2014-09 | Service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | (1,233) |  |  |
Adjustments | Accounting Standards Update 2014-09 | Product |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Statement Related Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenue |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,877 |  |  |

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