Short-term notes payable (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended			1 Months Ended		12 Months Ended		1 Months Ended				12 Months Ended			12 Months Ended			1 Months Ended		1 Months Ended		12 Months Ended		1 Months Ended												12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Apr. 30, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Apr. 23, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Dec. 31, 2013 April 2012 Note And Warrant Purchase Agreement [Member] Finders Fee Warrants [Member]	Dec. 31, 2013 April 2012 Note And Warrant Purchase Agreement [Member] Bridge Financing Warrants [Member]	Sep. 30, 2012 September Two Thousand Twelve Note Purchase Agreement [Member]	Sep. 14, 2012 September Two Thousand Twelve Note Purchase Agreement [Member]	Sep. 14, 2012 September Two Thousand Twelve Note Purchase Agreement [Member] Finders Fee Warrants [Member]	Sep. 14, 2012 September Two Thousand Twelve Note Purchase Agreement [Member] Administrative Fee Warrants [Member]	Dec. 31, 2013 Series D One Preferred Stock [Member]	Dec. 31, 2012 Series D One Preferred Stock [Member]	May 31, 2013 Series D One Preferred Stock [Member]	Dec. 31, 2013 Series D Two Preferred Stock [Member]	Dec. 31, 2012 Series D Two Preferred Stock [Member]	May 31, 2013 Series D Two Preferred Stock [Member]	Sep. 30, 2012 Series D Two Preferred Stock [Member] September Two Thousand Twelve Note Purchase Agreement [Member]	Sep. 14, 2012 Series D Two Preferred Stock [Member] September Two Thousand Twelve Note Purchase Agreement [Member]	Dec. 31, 2013 Series D Preferred Stock [Member]	May 31, 2013 Series D Preferred Stock [Member]	Dec. 31, 2013 Series D Two Preferred Stock For Cash [Member]	Dec. 31, 2012 Series D Two Preferred Stock For Cash [Member]	Nov. 30, 2012 Series D Financing [Member]	Sep. 30, 2012 September 2012 Closing [Member]	Nov. 30, 2012 November 2012 Closing [Member]	Dec. 31, 2013 Demand Notes [Member]	Nov. 06, 2013 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Aug. 02, 2013 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Apr. 18, 2013 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Sep. 05, 2012 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Aug. 20, 2012 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Mar. 05, 2012 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Feb. 17, 2012 Demand Notes [Member] Phoenix Banne Holding LLC [Member]	Nov. 20, 2013 Demand Notes [Member] Company Employee [Member]	Dec. 31, 2013 Demand Notes Warrants [Member]	Dec. 31, 2013 Demand Notes Warrants [Member] Interest Expense [Member]	Dec. 31, 2013 Demand Notes Warrants [Member] Debt Discount [Member]
Short-term notes payable [Abstract]
Amortization of debt discount and deferred financing costs	$ 44	$ 64
Loss on extinguishment of debt	67
Short-term Debt [Line Items]
Short-term Debt					1,000				1,103																		1,150		250	250	50	50	100	25	60
Repayments of Notes Payable								225													250			60	132	102
Interest Paid	1	21																			2			1
Proceeds from Notes Payable				982				778
Debt Instrument, Interest Rate, Stated Percentage					10.00%				10.00%																		10.00%			10.00%	10.00%	10.00%	10.00%	10.00%	10.00%
Class Of Warrant Or Right Number Of Warrants Or Rights Issued						349,000	5,000,000			294,000	3,000,000																	4,167,000								21,667,000	14,585,000	7,084,000
Fair value of warrants issued, initial						3	47			1	7																										406	111
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 0.0289	$ 0.0269	$ 0.0261			$ 0.050	$ 0.050			$ 0.05	$ 0.05																									$ 0.03
Derivative Liability, Fair Value, Gross Liability	25	128
Preferred Units, Issued																					230,000
Share Price														$ 0.0025			$ 0.05
Preferred Units, Components														1			4
Preferred Units, Description																					Units of Series D Preferred Shares consisting of one (1) share of Series D-1 Preferred Stock with an exercise price of $0.0025 per share and four (4) shares of Series D-2 Preferred Stock at an exercise price of $0.05 per share.
Proceeds from Issuance of Preferred Stock and Preference Stock												810			1,210	967		1,103			1,150		967
Offering expenses				17									76			114		115				13	115	190
Maturity date of loans borrowed				Apr. 22, 2013				Dec. 31, 2012
Number of common shares callable by warrants	3,583,000	27,625,000
Exercise period of warrants						3 years	3 years
Fair value assumptions for warrants pricing, expected term						3 years	3 years																													3 years
Fair value assumptions for warrants pricing, risk-free interest rate	3.04%	1.78%					1.78%
Fair value assumptions for warrants pricing, expected volatility rate	200.10%	205.30%				205.30%	205.30%
Conversion of short-term debt and accrued interest, net of offering costs				1,057																1,179				3,099
Series D-2 Preferred Shares issued in a private placement for cash, net of offering expenses, shares																		1,082,000					1,082,000
Purchase price per share for the shares sold in private placement					$ 1.00				$ 1.00										$ 1.00				$ 1.00
Shares issued in debt conversion								1,121,000				786,000			393,000
Proceeds from sale of stock, net																		$ 967		$ 870
Sale of Stock, Number of Shares Issued in Transaction												607,000			303,000