Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 03, 2015	Apr. 30, 2015	Dec. 31, 2014	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Investments [Line Items]
Cash to fund operations				$ 87,252,813	$ 138,349,733	$ 132,510,610	$ 19,114,444
Investments				24,365,922		44,741,378
Net increase (decrease) in cash				(45,257,797)	119,235,289
Cash outflow related to continuing operating activities				(53,687,381)	(24,496,567)
Cash payment for acquisition				10,000,000
Capital expenditures				1,135,651	1,251,987
Proceeds from sale of marketable securities				19,411,146	6,590,824
Proceeds from the exercise of warrants and stock options				313,751	$ 12,374,005
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 24 months
Investments				$ 24,400,000
Novartis
Schedule Of Investments [Line Items]
Cash payment for acquisition	$ 10,000,000	$ 3,000,000	$ 7,000,000	$ 10,000,000