DERIVATIVE INSTRUMENTS (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended	12 Months Ended
	May. 17, 2013	May. 31, 2014	May. 31, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Warrant or Right
Fair value of derivative warrant liability reclassified to additional paid-in capital			$ 25,241	$ 476	$ 16,121		$ 33,456
Redemption of outstanding investor warrants to common stock			11,726,343
Non-cash loss from modification of warrants	$ 765						765
Incremental fair value from warrant modification							765
Warrant derivative loss					10,804	$ 376	$ 18,871
Derivative instruments, fair value					$ 1,907	$ 7,224		$ 14,585
Common Stock | Public Offering - Underwritten
Class of Warrant or Right
Warrants issued with anti-dilution protection provisions		1,750,156
New Warrants
Class of Warrant or Right
Fair value of derivative warrant liability reclassified to additional paid-in capital	$ 7,738
Extended term of warrant	2 years
Warrants issued (in shares)	3,319,091
Merger Warrants
Class of Warrant or Right
Warrants to purchase shares of common stock tendered and exchange	255,000
Placement Agent Warrants
Class of Warrant or Right
Warrants to purchase shares of common stock tendered and exchange	3,064,091