Derivative liability - warrants (restated) (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Balance	$ 0
Issuance of warrants to purchase intangible assets	851
Fair value of warrant liability	(557)	0
Issuance of warrants with the issuance of Preferred Series A Convertible stock	6,731
Issuance of additional warrants due to anti-dilution provision	141
Transfers in and/or out of Level III	0
Balance	7,166	0
Fair Value, Inputs, Level 3 [Member]
Balance	0
Issuance of warrants to purchase intangible assets	851
Fair value of warrant liability	(557)
Issuance of warrants with the issuance of Preferred Series A Convertible stock	6,731
Issuance of additional warrants due to anti-dilution provision	141
Transfers in and/or out of Level III	0
Balance	$ 7,166