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Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Comprehensive Income Net Of Tax [Abstract]                              
Net income (loss) $ 960,000 $ 739,000 $ 582,000 $ (322,000) $ 955,000 $ 918,000 $ 507,000 $ 146,000 $ 2,000 $ (1,633,000) $ (2,193,000) $ (1,468,000) $ 1,959,000 $ 2,526,000 $ (5,292,000)
Other comprehensive income (loss):                              
Foreign currency translation adjustment                         (46,000) 0 0
Change in unrealized gain (loss) on investments                         7,000 5,000 (10,000)
Total comprehensive income (loss)                         $ 1,920,000 $ 2,531,000 $ (5,302,000)