Warrants (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Class of Warrant or Right [Line Items]
Number Outstanding	485,007
Remaining Contractual Life in Years	1 year 9 months 18 days
Number Currently Exercisable	485,007
Weighted Average Exercise Price	$ 5.17
Warrant issued in 2010
Class of Warrant or Right [Line Items]
Number Outstanding	16,780
Remaining Contractual Life in Years	3 months 18 days
Number Currently Exercisable	16,780
Weighted Average Exercise Price	$ 6.26
Warrant issued in 2011
Class of Warrant or Right [Line Items]
Number Outstanding	418,780
Remaining Contractual Life in Years	1 year 8 months 12 days
Number Currently Exercisable	4,187,800
Weighted Average Exercise Price	$ 4.84
Warrant issued in 2012
Class of Warrant or Right [Line Items]
Number Outstanding	49,447
Remaining Contractual Life in Years	2 years 9 months 18 days
Number Currently Exercisable	49,447
Weighted Average Exercise Price	$ 7.58