(LOSS) EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator:
Net loss	$ (25,442)	$ (55,512)	$ (26,344)	$ 41,564	$ (80,954)	$ 15,220
Less: Deemed Dividend	0		(147)		0	(147)
Less: Income attributable to participating securities - basic	0		0		0	(322)
Net (loss) income attributable to common stockholders - basic	$ (25,442)		$ (26,491)		$ (80,954)	$ 14,751
Denominator:
Weighted-average common shares outstanding - basic (in shares)	175,393,000		112,569,000		166,264,000	111,189,000
Net (loss) per common share - basic (in dollars per share)	$ (0.15)		$ (0.24)		$ (0.49)	$ 0.13
Dilutive Earnings (Loss) Per Share:
Less: Income attributable to participating securities - diluted	$ 0		$ 0		$ 0	$ (2,473)
Net (loss) income attributable to common stockholders - diluted	$ (25,442)		$ (26,491)		$ (80,954)	$ 12,600
Dilutive impact from:
Stock options and employee stock purchase plan (in shares)	0		0		0	14,000
Weighted-average common shares outstanding for diluted (in shares)	175,393,000		112,569,000		166,264,000	111,203,000
Net (loss) income per common share - diluted (in dollars per share)	$ (0.15)		$ (0.24)		$ (0.49)	$ 0.11
Potentially dilutive securities outstanding
Common stock equivalents excluded from calculation of diluted net (loss) income per share (in shares)	18,743,000		12,475,000		18,743,000	10,044,000
Warrants
Potentially dilutive securities outstanding
Common stock equivalents excluded from calculation of diluted net (loss) income per share (in shares)	1,394,000		2,485,000		1,394,000	55,000
Stock options
Potentially dilutive securities outstanding
Common stock equivalents excluded from calculation of diluted net (loss) income per share (in shares)	17,349,000		9,990,000		17,349,000	9,989,000