Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Current Assets
Allowance for doubtful accounts	$ 1,407	$ 866
Stockholders' Equity
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	0	0
Common stock, par value (dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	14,216,596	14,710,591
Common stock, shares outstanding	14,216,596	14,710,591