NET LOSS PER COMMON SHARE - EPS Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted average common shares outstanding, basic and diluted (in shares)	44,763,843	41,957,860	43,943,370	41,685,599
Net loss	$ (26,068)	$ (38,701)	$ (25,260)	$ (79,678)
Net income (loss) per common share, basic and diluted (in dollars per share)	$ (0.58)	$ (0.92)	$ (0.57)	$ (1.91)