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
	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share Basic And Diluted [Abstract]
Net loss	$ (607)	$ (322)
Weighted-average common shares outstanding - basic and diluted	32,376,671	31,094,417
Net loss per share – basic and diluted	$ (0.02)	$ (0.01)