WARRANTS (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended			9 Months Ended	12 Months Ended
	Jan. 31, 2020	Mar. 31, 2018	Jan. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Class Of Warrant Or Right [Line Items]
Exercise period of warrants					30 days
Number of warrants outstanding					73,327,000	87,792,000	309,000
Issuance of preferred stock (in shares)						41,000
Derecognized amount of Series D preferred stock at conversion		$ 23.0		$ 54.0
Series A and B Preferred Stocks
Class Of Warrant Or Right [Line Items]
Number of warrants issued (in shares)					200,000
Number of common stock purchase for each warrant					0.05
Series A and B Preferred Stocks | Minimum
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)					$ 10.30
Series A and B Preferred Stocks | Maximum
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)					$ 12.88
Series B Warrants
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding					200,000
Series C, Series D and Series E Warrants
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)					$ 0.0001
Number of common stock purchase for each warrant					0.05
Series C, Series D and Series E Warrants | Participant Holders
Class Of Warrant Or Right [Line Items]
Conversion of stock, maximum percentage of ownership after transaction					10.00%
Series C Warrants | Exchange | Second Lien Notes and Senior Secured Notes | Secured Debt
Class Of Warrant Or Right [Line Items]
Issuance of preferred stock (in shares)			8,300,000		4,800,000
Series C Warrants | Exchange | Second Lien Notes and Senior Secured Notes | Secured Debt
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding					6,900,000
Series D Warrant | Exchange | Second Lien Notes and Senior Secured Notes | Secured Debt
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)		$ 0.0001
Number of warrants outstanding		14,100,000			11,100,000
Number of preferred stock convertible shares to be issued in conversion (in shares)		14,100,000
Series E Warrants | Exchange | Second Lien Notes and Senior Secured Notes | Secured Debt
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)				$ 0.0001
Number of warrants outstanding				94,800,000	54,600,000
Number of preferred stock convertible shares to be issued in conversion (in shares)				94,800,000
Series F Warrants
Class Of Warrant Or Right [Line Items]
Exercise price of warrants (in dollars per share)					$ 0.0001
Number of warrants outstanding					400,000
Derecognized amount of Series D preferred stock at conversion					$ 6.9
Remaining number of warrants					1,200,000
Series F Warrants | Warrant Agreement
Class Of Warrant Or Right [Line Items]
Debt conversion, warrants issued					2,300,000
Series F Warrants | Subsequent Event | NASDAQ
Class Of Warrant Or Right [Line Items]
Number of additional warrants issued	400,000
Series F Warrants | Amendment of Credit Facility
Class Of Warrant Or Right [Line Items]
Number of preferred stock convertible shares to be issued in conversion (in shares)					400,000
Series F Warrants | Participant Holders
Class Of Warrant Or Right [Line Items]
Conversion of stock, maximum percentage of ownership after transaction					10.00%
Series F Warrants | Maximum | Warrant Agreement
Class Of Warrant Or Right [Line Items]
Issuance of warrants					2,000,000
Additional warrants issuable percentage of common stock					10.00%