Nature of Operations (Details 2) (USD $)	0 Months Ended						1 Months Ended	9 Months Ended
	Apr. 30, 2014	Mar. 11, 2014	Jan. 15, 2014	Sep. 16, 2013	Feb. 22, 2013	Feb. 20, 2013	Feb. 28, 2013	Sep. 30, 2014	Sep. 30, 2013
Liquidity
Shares of common stock issued in an underwritten public offering	22,600,000	3,902,440	10,000,000	18,600,000		18,910,000		23,832,038
Shares of common stock that can be purchased from warrants issued in an underwritten public offering			4,000,000			18,910,000
Number of shares of common stock in each fixed combination of shares and the warrants sold			1			1
Number of warrants in each fixed combination of shares and the warrants sold to purchase one share of common stock			0.40			1
Price of per fixed combination of the shares and the warrants sold			$ 3.00			$ 0.15
Gross proceeds from sales of fixed combination of the shares and the warrants			$ 30,000,000
Warrants exercise price (in dollars per share)			$ 4.00
Net proceeds from public offering			27,970,256	10,559,892		1,948,766	2,313,560	165,722,618
Per share price of shares of common stock sold in an underwritten public offering	$ 5.50	$ 5.74		$ 0.54
Gross proceeds from shares of common stock sold in an underwritten public offering	124,300,000	22,400,000
Net proceeds from shares of common stock sold in an underwritten public offering	$ 116,443,375	$ 21,308,987		$ 9,151,221	$ 364,794			$ 176,700,005	$ 14,807,717
Minimum period for which we believe that our current cash, cash equivalents, cash generated from future sales, and cash generated from the exercise of outstanding warrants will provide sufficient liquidity to fund operations								12 months