SUBSEQUENT EVENT (Details) - $ / shares shares in Thousands	1 Months Ended	9 Months Ended
	Oct. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2018
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)			$ 1.47	$ 1.20
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	26,307	9,258
Warrants Exercised (in shares)		(3,361)
Warrants outstanding, ending balance (in shares)		26,307
Warrants, Expiring June 2020
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)		$ 1.47
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	20,410	0
Warrants Exercised (in shares)		0
Warrants outstanding, ending balance (in shares)		20,410
Warrants, Expiring March 2023
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)		$ 1.20
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	5,350	7,211
Warrants Exercised (in shares)		(1,861)
Warrants outstanding, ending balance (in shares)		5,350
Warrants, Expiring November 2022
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)		$ 0.80
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	492	1,992
Warrants Exercised (in shares)		(1,500)
Warrants outstanding, ending balance (in shares)		492
Warrants, Expiring November 2024, Issued May 2015
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)		$ 11.83
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	28	28
Warrants Exercised (in shares)		0
Warrants outstanding, ending balance (in shares)		28
Warrants, Expiring November 2024, Issued November 2014
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)		$ 11.04
Warrant Or Right Outstanding [Roll Forward]
Warrants outstanding, beginning balance (in shares)	27	27
Warrants Exercised (in shares)		0
Warrants outstanding, ending balance (in shares)		27
Subsequent Event
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	(3,412)
Warrants outstanding, ending balance (in shares)	22,895
Subsequent Event | Warrants, Expiring June 2020
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)	$ 1.47
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	0
Warrants outstanding, ending balance (in shares)	20,410
Subsequent Event | Warrants, Expiring March 2023
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)	$ 0.95
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	(3,407)
Warrants outstanding, ending balance (in shares)	1,943
Subsequent Event | Warrants, Expiring November 2022
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)	$ 0.55
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	(5)
Warrants outstanding, ending balance (in shares)	487
Subsequent Event | Warrants, Expiring November 2024, Issued May 2015
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)	$ 11.83
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	0
Warrants outstanding, ending balance (in shares)	28
Subsequent Event | Warrants, Expiring November 2024, Issued November 2014
Subsequent Event [Line Items]
Exercise price per warrant (in dollars per share)	$ 11.04
Warrant Or Right Outstanding [Roll Forward]
Warrants Exercised (in shares)	0
Warrants outstanding, ending balance (in shares)	27