Series A convertible preferred stock (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended				3 Months Ended	9 Months Ended						1 Months Ended		1 Months Ended		3 Months Ended	9 Months Ended	1 Months Ended					9 Months Ended
	May 20, 2013	May 31, 2013	Apr. 30, 2013	Nov. 30, 2012	Sep. 30, 2013	Sep. 30, 2013	Sep. 03, 2013	Apr. 26, 2013	Dec. 31, 2012	Oct. 31, 2012	Sep. 30, 2012	Apr. 30, 2013 Maximum [Member]	Apr. 26, 2013 Maximum [Member]	Apr. 30, 2013 Minimum [Member]	Apr. 26, 2013 Minimum [Member]	Sep. 30, 2013 Warrant Waiver Agreement [Member]	Sep. 30, 2013 Warrant Waiver Agreement [Member]	Oct. 30, 2013 Series A Convertible Preferred Stock [Member]	Sep. 30, 2013 Series A Convertible Preferred Stock [Member]	May 20, 2013 Series A Convertible Preferred Stock [Member]	May 31, 2013 Series A Convertible Preferred Stock [Member]	Nov. 30, 2012 Series A Convertible Preferred Stock [Member]	Sep. 30, 2013 Series A Convertible Preferred Stock [Member]	May 03, 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]
Subsidiary, Sale of Stock [Line Items]
Preferred stock, shares outstanding																			15,748				15,748		1,394,766
Issuance Of Warrants To Purchase Of Common Stock		200,000		400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					3.85	3.85	3.85	3.85	4.00
Preferred Stock Dividends, Shares																							236
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)					15,748	15,748					1,166,667													100,000		100,000
Reduction In Cash Consideration						$ 108
Service Agreements Total Expenses																						444
Warrants Trigger Modification Percentage																				60.00%
Common Stock Issued For Consideration																				162,460
Class of Warrant or Right, Outstanding	403,029																			2,044,982
Warrants and Rights Outstanding	1,164																			6,525
Adjustments To Additional Paid In Capital Reclassification Of Warrants Into Equity	1,164					1,164														6,525
Gain Loss On Mark To Market Of Intangible Assets					0	605										0	3,204
Remaining cash consideration reduced																								6
Stock Issued During Period, Shares, Restricted Stock Award, Gross																		598	210		50,000
Reduction in future cash consideration		20
Consideration of month to month service agreement		15
Derivative Liability, Fair Value, Gross Liability					$ 0	$ 0		$ 1,680	$ 7,166
Fair Value Assumptions, Risk Free Interest Rate	0.85%											0.85%		0.68%
Fair Value Assumptions, Expected Term	4 years 5 months 8 days		4 years 5 months 8 days
Fair Value Assumptions, Expected Volatility Rate	75.00%		75.00%
Fair Value Assumptions, Exercise Price	$ 3.85							$ 3.85
Share Price	$ 5.03												$ 4.27		$ 3.90
Conversion of Stock, Shares Converted						1,400,487
Conversion of Stock, Shares Issued						1,400,487
Cash Maintenance Provision Limit On Shares										345,012
Warrants Exercised By Holders			715,742