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Stockholders' Equity - Stock Option Activity (Detail) - $ / shares
 9 Months Ended 12 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Number of Shares, Options Outstanding, Beginning Balance (in shares) 2,845,866  
Number of Shares, Granted (in shares) 299,397  
Number of Shares, Exercised (in shares) (186,505)  
Number of Shares, Canceled (in shares) (87,742)  
Number of Shares, Options Outstanding, Ending Balance (in shares) 2,871,016 2,845,866
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted-Average Exercise Price, Outstanding, Beginning Balance (in dollars per share) $ 4.21  
Weighted-Average Exercise Price, Granted (in dollars per share) 8.60  
Weighted-Average Exercise Price, Exercised (in dollars per share) 2.65  
Weighted-Average Exercise Price, Canceled (in dollars per share) 5.24  
Weighted-Average Exercise Price, Outstanding, Ending Balance (in dollars per share) $ 4.73 $ 4.21
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]    
Weighted-Average Remaining Contractual Term, Outstanding (in years) 5 years 4 months 13 days 5 years 5 months 1 day