Short-term notes payable (Details Textual) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended				1 Months Ended		1 Months Ended			1 Months Ended				1 Months Ended				1 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2011 Warrants Issued To Consultants [Member]	Jun. 30, 2012 Warrants Issued To Consultants [Member]	Sep. 30, 2011 September 2011 Note And Warrant Purchase Agreement [Member]	Jun. 30, 2012 September 2011 Note And Warrant Purchase Agreement [Member]	Sep. 20, 2011 September 2011 Note And Warrant Purchase Agreement [Member]	Dec. 31, 2011 December 2011 Note And Warrant Purchase Agreement [Member]	Jun. 30, 2012 December 2011 Note And Warrant Purchase Agreement [Member]	Feb. 29, 2012 December 2011 Note And Warrant Purchase Agreement [Member]	Dec. 20, 2011 December 2011 Note And Warrant Purchase Agreement [Member]	Feb. 29, 2012 December 2011 Note And Warrant Purchase Agreement [Member] Common stock [Member]	Apr. 30, 2012 April 2012 Note And Warrant Purchase Agreement [Member]	Jun. 30, 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]	Jun. 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. 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]
Short Term Notes Payble Details Textual [Abstract]
Interest expense associated with the Company's debt	$ 51	$ 1	$ 81	$ 1
Interest expense associated with the Company's debt, related party	31	0	58	0
Amortization of debt discount and deferred financing costs	12	0	(18)	0
Amortization of debt discount and deferred financing costs, related party	4	0	8	0
Short-term Debt [Line Items]
Aggregate amount of loans borrowed											500				500				1,000				100	25	100
Stated percentage of loans borrowed											10.00%				10.00%				10.00%				10.00%	10.00%	10.00%
Maturity date of loans borrowed									Sep. 20, 2012			Dec. 20, 2012					Apr. 22, 2013
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 $100			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 $100
Associated derivative transaction, threshold amount											100				100
Number of common shares callable by warrants											5,556				5,556				5,000,000
Warrants Weighted Average Exercise Price	$ 0.0266		$ 0.0266		$ 0.0261	$ 0.0274					$ 0.0225				$ 0.0225				$ 0.05			$ 0.0500
Fair value of warrants outstanding, initial							1				7				13				47			2
Fair value of warrants outstanding								2		13			2					47			3
Fair value assumptions for warrants pricing, risk-free interest rate							7.00%		42.00%			39.00%					40.00%			40.00%
Fair value assumptions for warrants pricing, expected term							3 years		3 years			3 years					3 years			3 years
Fair value assumptions for warrants pricing, expected volatility rate							190.00%		204.00%			202.00%					213.00%			213.00%
Fair value assumptions for warrants pricing, expected dividend							0.00%		0.00%			0.00%					0.00%			0.00%
Number of warrants outstanding							1,000						556									349
Exercise period of warrants							3 years		3 years			3 years					3 years			3 years
Number of shares issued by warrants excercise														5,000		4,043
Number of shares issued by warrants excercise, cashless														4,889
Number of shares issued by warrants excercise, for cash														111
Proceeds from issuance of common stock, related to warrants exercise																$ 2