FAIR VALUE DISCLOSURES - RECONCILLIATION OF THE CHANGES IN LEVEL 3 FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Warrant | Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2012	$ 4,857
Total losses included in net loss	5,713
Write off of derivative liabilities	0	[1]
Balance at March 31, 2013	10,570
Convertible Debt Securities | Derivative – Convertible Notes Embedded Derivative(2)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2012	17,173
Total losses included in net loss	12,733
Write off of derivative liabilities	(26,641)	[1]
Balance at March 31, 2013	3,265
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at December 31, 2012	7,000
Total losses included in net loss	0
Write off of derivative liabilities	0	[1]
Balance at March 31, 2013	$ 7,000

[1] Represents the pro rata portion of derivative liability associated with tendered Convertible Notes measured at the date of exchange, which is included in the gain on extinguishment of debt on the accompanying condensed consolidated statements of operations.