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Basis of Presentation and Significant Accounting Policies - Summary of Status of Company's Non-Vested Shares (Detail)
9 Months Ended
Jun. 30, 2017
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Outstanding Beginning Balance (in shares) 1,602,822
Shares, Granted (in shares) 315,020
Options, Forfeited (in shares) (84,314)
Options, Outstanding Ending Balance (in shares) 1,833,528
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-Average Grant Date Fair Value, Granted (in usd per share) | $ / shares $ 1.83
Non-Vested Stock Options  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Options, Outstanding Beginning Balance (in shares) 539,985
Shares, Granted (in shares) 315,020
Shares, Vested (in shares) (256,248)
Options, Forfeited (in shares) (31,072)
Options, Outstanding Ending Balance (in shares) 567,685
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-Average Grant Date Fair Value, Non-vested Beginning Balance (in usd per share) | $ / shares $ 3.21
Weighted-Average Grant Date Fair Value, Granted (in usd per share) | $ / shares 1.83
Weighted-Average Grant Date Fair Value, Vested (in usd per share) | $ / shares 3.06
Weighted-Average Grant Date Fair Value, Forfeited (in usd per share) | $ / shares 2.58
Weighted-Average Grant Date Fair Value, Non-vested Ending Balance (in usd per share) | $ / shares $ 2.50