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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share Basic And Diluted [Abstract]        
Net income $ 582 $ 508 $ 260 $ 654
Weighted-average common shares outstanding - basic 31,325,577 30,697,391 31,214,325 30,657,308
Weighted-average common shares outstanding - diluted 33,133,920 31,321,259 32,625,526 31,241,374
Net income per share - Basic $ 0.02 $ 0.02 $ 0.01 $ 0.02
Net income per share - Diluted $ 0.02 $ 0.02 $ 0.01 $ 0.02