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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Accounting Policies [Abstract]        
Net income $ 1,217 $ 582 $ 610 $ 260
Weighted-averages shares outstanding - basic (in shares) 32,786,079 31,325,577 32,581,988 31,214,325
Common stock equivalents (in shares) 2,029,225 1,808,343 2,236,404 1,411,201
Weighted-averages shares outstanding - diluted (in shares) 34,815,304 33,133,920 34,818,392 32,625,526
Net income per share:        
Basic (in dollars per share) $ 0.04 $ 0.02 $ 0.02 $ 0.01
Diluted (in dollars per share) $ 0.03 $ 0.02 $ 0.02 $ 0.01