Organization and Significant Accounting Policies - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	May 31, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule Of Investments [Line Items]
Cash to fund operations		$ 132,510,610	$ 19,114,444	$ 3,377,288	$ 7,507,389
Investments		44,741,378	10,732,414
Net increase (decrease) in cash		113,396,166	15,737,156	(4,130,101)
Cash from issuance of equity	36,000,000	172,641,671	42,448,826	10,883,992
Proceeds from the exercise of warrants and stock options		12,878,044	2,057,178	74,239
Cash outflow related to continuing operating activities		(35,416,373)	(19,032,826)	(15,340,090)
Net cash invested in fixed income investments		34,800,000
Capital expenditures		1,717,362	296,880	479,710
Restricted Cash		0	0
Amount insured in FDIC per account		250,000
Minimum
Schedule Of Investments [Line Items]
Property, Plant and Equipment, Useful Life		3 years
Maximum
Schedule Of Investments [Line Items]
Property, Plant and Equipment, Useful Life		7 years
Commercial bonds
Schedule Of Investments [Line Items]
Maturity description		less than 2 years
Investments		$ 44,700,000