Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Ablaris Therapeutics	Sep. 30, 2014 2010 Warrants	Jun. 30, 2010 2010 Warrants	Sep. 30, 2014 2012 Warrants	Dec. 31, 2012 2012 Warrants	Sep. 30, 2014 2013 Warrants	Jan. 31, 2013 2013 Warrants
Fair Value Measurements Disclosure [Line Items]
Short term investments	$ 21,653,032	$ 9,030,261
Investments	23,088,346	1,702,153
Total investments	44,741,378	10,732,414
Fair value of investment	44,333,855	10,698,271
Warrants issued to acquire Common Stock					329,649		912,543		833,530
Non-cash gain (loss) from change in fair value of the derivative liability	$ (5,821,796)		$ (211,860)
Warrants outstanding	1,490,589			24,324		265,161		12,123
Duration of exchange rights	7 years
Exchange right convertible conversion ratio for first year			0.06
Exchange right convertible conversion ratio for second year			0.04
Exchange right convertible conversion ratio for third year			0.03
Exchange right convertible conversion ratio for fourth year			0.02
Exchange right convertible conversion ratio for fifth year and beyond			0.01
Number of exchange right sold			675,000