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Stock-Based Compensation - Summarize Information about Stock Options (Detail)
 3 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Options Outstanding, beginning balance | shares 5,435,640
Number of Options Outstanding, Granted | shares 82,000
Number of Options Outstanding, Cancelled | shares (47,169)
Number of Options Outstanding, Exercised | shares (4,687)
Number of Options Outstanding, ending balance | shares 5,465,784
Number of Options Outstanding, Exercisable | shares 2,956,400
Weighted Average Exercise Price Per Share, beginning balance | $ / shares $ 6.71
Weighted Average Exercise Price Per Share, Granted | $ / shares 5.96
Weighted Average Exercise Price Per Share, Cancelled | $ / shares 8.56
Weighted Average Exercise Price Per Share, Exercised | $ / shares 5.45
Weighted Average Exercise Price Per Share, ending balance | $ / shares 6.69
Weighted Average Exercise Price Per Share, Exercisable | $ / shares $ 6.12
Weighted Average Remaining Contractual Term 7 years 7 months 6 days
Weighted Average Remaining Contractual Term, Exercisable 6 years 9 months 18 days
Aggregate Intrinsic Value | $ $ 6,925,846
Aggregate Intrinsic Value, Exercisable | $ $ 4,766,553