Restatement of previously issued financial statement (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013	Dec. 31, 2011
Intangible assets, net of accumulated amortization (in dollars)	$ 118
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	75,000,000	75,000,000	75,000,000
Common stock, shares issued	3,251,187	3,522,935	2,108,732
Common stock, shares outstanding	3,251,187	3,522,935	2,108,732
Issuance of Preferred stock & warrants, issuance costs (in dollars)	87
Series A Convertible Preferred Stock [Member]
Temporary Equity, Par Value (in dollars per share)	$ 0.001
Temporary Equity, Shares Authorized	1,394,766
Temporary Equity, Shares Issued	1,394,766
Temporary Equity, Shares Outstanding	1,394,766
Temporary Equity, Liquidation Preference (in dollars)	4,547
Preferred stock,par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,394,766	1,413,572
Preferred stock, shares issued	1,394,766	1,139,870
Preferred stock, shares outstanding	1,394,766	1,139,870
Preferred Stock, Liquidation Preference, Value (in dollars)	$ 4,547