Short-term notes payable (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			12 Months Ended			1 Months Ended		1 Months Ended	4 Months Ended			1 Months Ended				1 Months Ended				1 Months Ended		1 Months Ended			1 Months Ended				1 Months Ended			1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Series D One Preferred Stock [Member]	Dec. 31, 2012 Series D Two Preferred Stock For Cash [Member]	Dec. 31, 2010 Series D Two Preferred Stock For Cash [Member]	Aug. 31, 2011 Warrants Issued To Consultants [Member]	Dec. 31, 2012 Warrants Issued To Consultants [Member]	Nov. 30, 2012 Series D Financing [Member]	Dec. 31, 2011 September 2011 Note And Warrant Purchase Agreement [Member]	Dec. 31, 2012 September 2011 Note And Warrant Purchase Agreement [Member]	Sep. 20, 2011 September 2011 Note And Warrant Purchase Agreement [Member]	Nov. 30, 2012 September 2011 Note And Warrant Purchase Agreement [Member] Series D One Preferred Stock [Member]	Dec. 31, 2011 December 2011 Note And Warrant Purchase Agreement [Member]	Dec. 31, 2012 December 2011 Note And Warrant Purchase Agreement [Member]	Dec. 20, 2011 December 2011 Note And Warrant Purchase Agreement [Member]	Nov. 30, 2012 December 2011 Note And Warrant Purchase Agreement [Member] Series D One Preferred Stock [Member]	Apr. 30, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Dec. 31, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Apr. 23, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Apr. 30, 2012 April 2012 Note And Warrant Purchase Agreement [Member] Warrants Issued To Consultants [Member]	Apr. 23, 2012 April 2012 Note And Warrant Purchase Agreement [Member] Warrants Issued To Consultants [Member]	Sep. 30, 2012 September 2012 Note Purchase Agreement [Member]	Sep. 14, 2012 September 2012 Note Purchase Agreement [Member]	Nov. 15, 2012 September 2012 Note Purchase Agreement [Member] Warrants Issued To Consultants [Member]	Sep. 30, 2012 Unsecured Demand Notes One And Two [Member]	Sep. 02, 2011 Unsecured Demand Notes One And Two [Member]	Feb. 17, 2012 Unsecured Demand Note Three [Member]	Mar. 05, 2012 Unsecured Demand Note Four [Member]	Sep. 30, 2012 Unsecured Demand Notes Three And Four [Member]	Aug. 31, 2012 Unsecured Demand Note Five [Member]	Sep. 30, 2012 Unsecured Demand Note Six [Member]	Nov. 30, 2012 Unsecured Demand Notes Five And Six [Member]
Short Term Notes Payble Details Textual [Abstract]
Interest expense associated with the Company's debt	$ 189	$ 24
Interest expense associated with the Company's debt, related party	100	21
Amortization of debt discount and deferred financing costs	(64)	(3)
Amortization of debt discount and deferred financing costs, related party	14	3
Short-term Debt [Line Items]
Aggregate amount of loans borrowed												500				500								1,103			100	25	100		50	50
Proceeds from Notes Payable																		982					778
Stated percentage of loans borrowed												10.00%				10.00%				10.00%				10.00%			10.00%	10.00%	10.00%		10.00%	10.00%
Principal and accrued interest repaid in cash for demand notes																							225			107				132			102
Maturity date of loans borrowed										Sep. 20, 2012				Dec. 20, 2012				Apr. 22, 2013					Dec. 31, 2012
Conversion price				$ 0.225																$ 1.00				$ 1.00	$ 0.05
Description of the derivative transaction associated with the note										convertible at the option of the September 2011 Investor into securities sold in the next equity financing with gross proceeds to the Company in excess of $1				convertible at the option of the September 2011 Investor into securities sold in the next equity financing with gross proceeds to the Company in excess of $1
Associated derivative transaction, threshold amount												1				1
Consulting Fees																					17
Number of common shares callable by warrants												5,556				5,556				5,000
Warrants Weighted Average Exercise Price	$ 0.0269	$ 0.0261	$ 0.0274									$ 0.0225				$ 0.0225				$ 0.05		$ 0.05
Fair value of warrants outstanding, initial							1					7				13						2
Fair value of warrants outstanding								2			9								47
Fair value assumptions for warrants pricing, risk-free interest rate	1.78%						7.00%			42.00%				39.00%							40.00%
Fair value assumptions for warrants pricing, expected term							3 years			3 years				3 years							3 years
Fair value assumptions for warrants pricing, expected volatility rate	205.30%						190.00%			204.00%				202.00%							213.00%
Fair value assumptions for warrants pricing, expected dividend							0.00%			0.00%				0.00%							0.00%
Number of warrants outstanding							1,000,000								556,000							349,000			294,000
Exercise period of warrants							3 years			3 years				3 years							3 years
Conversion of short-term debt and accrued interest, net of offering costs									3,099
Series D-2 Preferred Shares issued in a private placement for cash, net of offering expenses, shares	1,082
Offering expenses				76	115				190
Series D-2 Preferred Shares issued in a private placement for cash, net of offering expenses of $115, values	$ 967
Purchase price per share for the shares sold in private placement						$ 1.00																		$ 1.00
Shares issued in debt conversion													560				550						1,103