Stockholders' Equity (Details 3) (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
Stockholders' equity
Shares of common stock issued	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
Exercise price of warrants (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	116,443,375	21,308,987		9,151,221	364,794			176,700,005	14,807,717
Warrants with exercise price of $0.15
Stockholders' equity
Exercise price of warrants (in dollars per share)								$ 0.15
Warrants with exercise price of $0.18
Stockholders' equity
Exercise price of warrants (in dollars per share)								$ 0.18
Over-allotment option
Stockholders' equity
Shares of common stock issued				2,790,000	2,801,800
Per share price of shares of common stock sold in an underwritten public offering				$ 0.54
Net proceeds from shares of common stock sold				$ 1,408,671
Over-allotment option | Warrants with exercise price of $0.15
Stockholders' equity
Exercise price of warrants (in dollars per share)						$ 0.15
Warrants issued						2,836,500
Over-allotment option | Warrants with exercise price of $0.18
Stockholders' equity
Exercise price of warrants (in dollars per share)						$ 0.18
Warrants issued						1,891,000