Summary of Significant Accounting Policies - Schedule of Total Share Compensation Classification Related to All of Company's Share-Based Awards (Detail) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Share-based compensation classified as:
Share-based compensation expense, total	$ 5,845,793	$ 4,877,482	$ 3,778,453
Research and development expense [Member]
Share-based compensation classified as:
Share-based compensation expense, total	1,071,932	964,876	644,057
Selling and marketing expense [Member]
Share-based compensation classified as:
Share-based compensation expense, total	1,650,256	908,299	600,023
General and administrative expense [Member]
Share-based compensation classified as:
Share-based compensation expense, total	$ 3,123,605	$ 3,004,307	$ 2,534,373