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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, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]                      
Net loss $ (45,583) $ (43,571) $ (42,324) $ (43,906) $ (45,034) $ (40,225) $ (38,413) $ (41,913) $ (175,383) $ (165,585) $ (172,368)
Weighted average common shares outstanding - basic (in shares)                 113,354 105,700 99,999
Weighted average common shares outstanding - diluted (in shares)                 113,354 105,700 99,999
Net loss per share:                      
Basic (in dollars per share) $ (0.39) $ (0.38) $ (0.38) $ (0.40) $ (0.42) $ (0.38) $ (0.37) $ (0.40) $ (1.55) $ (1.57) $ (1.72)
Diluted (in dollars per share) $ (0.39) $ (0.38) $ (0.38) $ (0.40) $ (0.42) $ (0.38) $ (0.37) $ (0.40) $ (1.55) $ (1.57) $ (1.72)