Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
Statement Of Financial Position [Abstract]
Trade accounts receivable, net of allowance	$ 1,453	$ 1,395
Non current financing receivables, net of allowance	$ 1,849	$ 1,020
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	13,600,541	13,438,316
Common stock, shares outstanding	13,600,541	13,438,316