STOCKHOLDERS' EQUITY (Details 2) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Nov. 30, 2017	Jan. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 21, 2012
Warrants - issued and outstanding
Proceeds from Issuance of Common Stock			$ 130,663	$ 153,530	$ 0
Number of warrants (in shares)			11,817,912
Number of warrants exercised (in shares)			0	52,825	289,789
Exercise of warrants for cash (in shares)				585,729	313,756
Proceeds from warrant exercises				$ 4,600	$ 2,100
Net exercise of warrants (in shares)				638,554	603,545
Common Stock
Warrants - issued and outstanding
Issuance of common stock, net of costs (in shares)			3,162,500	7,941,688
Exercise of warrants for cash (in shares)				585,729	313,756
Net exercise of warrants (in shares)				52,825	289,789
June 11, 2018 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)	$ 38.849
Proceeds from Issuance of Common Stock	$ 130,700
Number of warrants (in shares)	421,650
June 11, 2018 Warrants | Common Stock
Warrants - issued and outstanding
Issuance of common stock, net of costs (in shares)	3,162,500
Share Price	$ 38.85
November 20, 2017 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)	$ 12.999
Proceeds from Issuance of Common Stock	$ 86,700
Number of warrants (in shares)	4,137,999
November 20, 2017 Warrants | Common Stock
Warrants - issued and outstanding
Issuance of common stock, net of costs (in shares)	2,938,986
Share Price	$ 13.00
January 11, 2017 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)		$ 5.599	$ 0.001
Proceeds from Issuance of Common Stock		$ 66,800
Number of warrants (in shares)		7,258,263
January 11, 2017 Warrants | Common Stock
Warrants - issued and outstanding
Issuance of common stock, net of costs (in shares)		5,002,702
Share Price		$ 5.60
Private Placement | June 11, 2018 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)						$ 0.001
Number of warrants (in shares)	421,650
Private Placement | November 20, 2017 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)						$ 0.001
Number of warrants (in shares)	4,137,999
Private Placement | January 11, 2017 Warrants
Warrants - issued and outstanding
Exercise price (in dollars per share)			$ 0.001
Number of warrants (in shares)			7,258,263
Certain Holders
Warrants - issued and outstanding
Common stock, ownership proportion, threshold (as a percent)			999000.00%	1999000.00%
Other Holders
Warrants - issued and outstanding
Common stock, ownership proportion, threshold (as a percent)			1999000.00%	999000.00%