STOCKHOLDERS' EQUITY (DEFICIT) - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Jun. 30, 2019	Mar. 31, 2018	Sep. 30, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Warrant or Right [Line Items]
Proceeds from sale of stock	$ 27,800
Exercise price (in dollars per share)	$ 1.47			$ 1.47
Deemed dividend on adjustment of exercise price on certain warrants			$ 0		$ 147	$ 0
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					22,895,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						(20,410,000)
Warrants outstanding, ending balance (in shares)			2,485,000		2,485,000
Common Stock
Class of Warrant or Right [Line Items]
Proceeds from sale of stock		$ 9,000
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)				(3,361,115)
Warrants, Expiring June 2020
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 1.47		$ 1.47
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					20,410,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						(20,410,000)
Warrants outstanding, ending balance (in shares)			0		0
Warrants, Expiring March 2023
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 0.55		$ 0.55
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					1,943,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						0
Warrants outstanding, ending balance (in shares)			1,943,000		1,943,000
Warrants, Expiring November 2022
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 0.55		$ 0.55
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					487,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						0
Warrants outstanding, ending balance (in shares)			487,000		487,000
Warrants, Expiring November 2024
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 11.83		$ 11.83
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					28,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						0
Warrants outstanding, ending balance (in shares)			28,000		28,000
Warrants, Expiring November 2024
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 11.04		$ 11.04
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)					27,000
Warrants Issued (in shares)					0
Warrants Exercised (in shares)					0
Warrants Expired (in shares)						0
Warrants outstanding, ending balance (in shares)			27,000		27,000
2018 Warrant Amendment Agreement
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)		$ 1.20
Reduction in warrant exercise price (in dollars per share)		$ 0.95