Derivative Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	$ 20,224	$ 20,337
Series C preferred embedded derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	14,209	13,804
Warrant derivative [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	6,015	6,533
Derivative liabilities at fair value 2015 [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, at fair value	$ 20,224	$ 20,337