(LOSS) PER SHARE PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earning per share reconciliation
Net (loss)	$ (25,372)	$ (28,717)
Weighted-average common shares outstanding (in shares)	79,808	78,584
(Loss) per share, basic (in dollars per share)	$ (0.32)	$ (0.37)
Weighted-average common shares outstanding, assuming dilution (in shares)	79,808	78,584
(Loss) per share, diluted (in dollars per share)	$ (0.32)	$ (0.37)
Outstanding anti-dilutive stock options and RSUs (in shares)	5,948	5,563
Convertible Debt
Earning per share reconciliation
Initial conversion price (in dollars per share)	$ 135.05