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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, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]                      
Net loss $ (45,034) $ (40,225) $ (38,413) $ (41,913) $ (50,100) $ (47,071) $ (40,932) $ (34,265) $ (165,585) $ (172,368) $ (88,739)
Weighted average common shares outstanding - basic and diluted (in shares)                 105,700 99,999 94,533
Net loss per share - basic and diluted (in dollars per share) $ (0.42) $ (0.38) $ (0.37) $ (0.40) $ (0.49) $ (0.47) $ (0.42) $ (0.36) $ (1.57) $ (1.72) $ (0.94)