Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 331	$ 310
Preferred stock, par value
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Common stock, par value
Common stock, shares authorized	71,000,000	71,000,000
Common stock, shares issued	42,488,602	42,399,962