SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basic and Diluted Net Loss Per Share (Details) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Warrants
Basic and Diluted Net Loss Per Share
Shares not included in computation of diluted loss per share because they are anti-dilutive	98,013,256	98,013,256
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	2,621,268	421,268
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	909,837	909,837