Stockholders' Equity - Stock Option Activity (Detail) - $ / shares	9 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Sep. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Beginning balance	2,334,326
Number of Shares, Granted	1,917,500	0
Number of Shares, Exercised	(110,769)
Number of Shares, Cancelled	(363,064)
Number of Shares, Ending balance	3,777,993	2,616,121	2,334,326
Weighted Average Exercise Price Per Share, Beginning balance	$ 4.11
Weighted Average Exercise Price Per Share, Granted	2.91
Weighted Average Exercise Price Per Share, Exercised	3.78
Weighted Average Exercise Price Per Share, Cancelled	3.88
Weighted Average Exercise Price Per Share, Ending balance	$ 3.61	$ 4.19	$ 4.11
Weighted Average Remaining Contractual Term (in Years)	7 years 1 month 28 days		5 years 5 months 16 days