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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 121,478 | $ 118,567 | $ 109,517 | $ 96,675 | $ 93,767 | $ 89,912 | $ 85,682 | $ 83,225 | $ 446,237 | $ 352,586 | $ 296,500
Gross profit | 63,857 | 62,348 | 59,820 | 58,984 | 59,174 | 56,962 | 54,083 | 52,395 |  |  |
Loss from operations | (46,154) | (43,168) | (37,944) | (32,553) | (27,425) | (24,238) | (21,987) | (15,983) | (159,819) | (89,633) | (41,896)
Net income (loss) | $ (50,100) | $ (47,071) | $ (40,932) | $ (34,265) | $ (28,131) | $ (23,771) | $ (21,482) | $ (15,355) | $ (172,368) | $ (88,739) | $ (104,497)
Net income (loss) per share: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in dollars per share) | $ (0.49) | $ (0.47) | $ (0.42) | $ (0.36) | $ (0.29) | $ (0.25) | $ (0.23) | $ (0.16) | $ (1.72) | $ (0.94) | $ (1.14)

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