STOCKHOLDERS' DEFICIT - 2016 Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jun. 22, 2016	Dec. 31, 2016
Class of Stock [Line Items]
Net proceeds of public stock offering		$ 83,267
Common Stock
Class of Stock [Line Items]
Net proceeds of public stock offering		$ 4
Common Stock | Secondary Offering
Class of Stock [Line Items]
Shares issued (in shares)	45,200,000
Stock offering price (in USD per share)	$ 2.00
Net proceeds of public stock offering	$ 83,300
Common Stock | Over-Allotment Option
Class of Stock [Line Items]
Shares issued (in shares)	5,200,000