SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basic and Diluted Net Loss Per Share (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Warrants
Basic and Diluted Net Loss Per Share
Shares not included in computation of diluted loss per share because they are anti-dilutive	89,535,000	89,535,000
Shares Issued upon conversion of Senior Notes
Basic and Diluted Net Loss Per Share
Shares not included in computation of diluted loss per share because they are anti-dilutive	5,910,000	5,910,000
Unvested Stock Awards
Basic and Diluted Net Loss Per Share
Shares not included in computation of diluted loss per share because they are anti-dilutive	1,785,435	1,105,435
Stock Appreciation Rights
Basic and Diluted Net Loss Per Share
Shares not included in computation of diluted loss per share because they are anti-dilutive	1,175,767	1,269,101