Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 230	$ 19
Series A preferred stock, par value	$ 0.05	$ 0.05
Series A preferred stock, shares authorized	450,000	450,000
Series A preferred stock, shares issued	0	0
Series A preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.05	$ 0.05
Common stock, shares authorized	45,000,000	45,000,000
Common stock, shares issued	13,094,988	13,208,443
Common stock, shares outstanding	13,094,988	13,208,443