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NET LOSS PER SHARE - Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Numerator:                      
Net loss available to common stockholders $ (50,100) $ (47,071) $ (40,932) $ (34,265) $ (28,131) $ (23,771) $ (21,482) $ (15,355) $ (172,368) $ (88,739) $ (104,497)
Denominator:                      
Denominator for basic and diluted calculation (in shares)                 99,999 94,533 92,017
Net 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)