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NET LOSS PER SHARE - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
NET LOSS PER SHARE
Net loss	$ (23,542)	$ (9,778)	$ (19,814)	$ (99,191)	$ (25,132)	$ (11,465)	$ (13,014)	$ (10,136)	$ (152,325)	$ (59,747)	$ (44,870)
Weighted average common shares outstanding:									403,457	361,845	337,297
Diluted shares outstanding:									403,457	361,845	337,297
Net loss per share:
Basic and Diluted (in dollars per share)	$ (0.06)	$ (0.02)	$ (0.05)	$ (0.25)	$ (0.07)	$ (0.03)	$ (0.04)	$ (0.02)	$ (0.38)	$ (0.17)	$ (0.13)

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