Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017
Statement Of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 204	$ 230
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	13,195,616	13,094,988
Common stock, shares outstanding	13,195,616	13,094,988