Restatement of previously issued financial statements (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	May 20, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 Series A Convertible Preferred Stock [Member]	Feb. 28, 2013 Series A Convertible Preferred Stock [Member]	Dec. 31, 2012 Series A Convertible Preferred Stock [Member]	Nov. 02, 2012 Series A Convertible Preferred Stock [Member]	Dec. 31, 2011 Series A Convertible Preferred Stock [Member]
Waiver Agreements From Warrant Holders, Amount	$ 25
Waiver Agreements From Warrant Holders, Shares	100,000
Accumulated amortization		$ 118	$ 0
Temporary Equity, Par or Stated Value 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
Preferred stock,par value (in dollars per share)		$ 0.001	$ 0.001			$ 0.001		$ 0.001
Preferred stock, shares authorized		8,605,234	0			1,394,766		0
Preferred stock, shares issued		0	0			1,394,766		0
Preferred stock, shares outstanding		0	0	30,000	241,748	1,394,766	1,380,362	0