Warrants (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2007
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 8.12
Warrants Maturity Date	2020
Common Stock [Member]
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, Warants Exercised		47,791
GECC And Oxford [Member]
Class of Warrant or Right [Line Items]
Warrants Issued to Acquire Number of Convertible Preferred Stock			69,294
Warrants Maturity Date			2017