Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended					1 Months Ended	6 Months Ended
	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2014 2010 Warrants	Mar. 31, 2014 2012 Warrants	Mar. 31, 2014 2013 Warrants	Jan. 31, 2011 Unidym Inc	Mar. 31, 2014 Ablaris Therapeutics
Fair Value Measurements Disclosure [Line Items]
Short term investments	$ 17,798,475	$ 9,030,261
Long-term investments	34,048,359	1,702,153
Total investments	51,846,834	10,732,414
Fair value of investments	51,563,458	10,698,271
Non cash consideration received in sale of interest in subsidiary, bonds						2,500,000
Bond convertible conversion price per share						$ 2.00
Warrants issued to acquire Common Stock			329,649	912,543	833,530
Warrants outstanding	2,533,507		24,324	265,461	39,623
Non-cash gain (loss) from change in fair value of the derivative liability	$ 9,234,419						$ 53,190
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