Financing (Details 9) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair value adjustments:
Compound embedded derivatives	$ 15	$ (107)	$ 10	$ (244)
Warrant derivatives	0	(207)	1	(580)
Hybrid instruments	1,716	$ 628	3,231	$ 1,173
Fair Value, Inputs, Level 3 [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:			37,392
Fair value adjustments:
Compound embedded derivatives			10
Warrant derivatives			1
Hybrid instruments			3,231
Conversions:
August 24, 2006 financing			(12)
August 14, 2009 financing			(16)
Sep 15, 2014 financing			(20)
Ending balance, June 30, 2015	40,586		40,586
Fair Value, Inputs, Level 3 [Member] | Compound embedded derivatives [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:			6
Fair value adjustments:
Compound embedded derivatives			10
Warrant derivatives			0
Hybrid instruments			0
Conversions:
August 24, 2006 financing			0
August 14, 2009 financing			0
Sep 15, 2014 financing			0
Ending balance, June 30, 2015	16		16
Fair Value, Inputs, Level 3 [Member] | Warrant derivatives [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:			2
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			1
Hybrid instruments			0
Conversions:
August 24, 2006 financing			0
August 14, 2009 financing			0
Sep 15, 2014 financing			0
Ending balance, June 30, 2015	3		3
Fair Value, Inputs, Level 3 [Member] | Hybrid instruments [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:			37,384
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Hybrid instruments			3,231
Conversions:
August 24, 2006 financing			(12)
August 14, 2009 financing			(16)
Sep 15, 2014 financing			(20)
Ending balance, June 30, 2015	$ 40,567		$ 40,567