Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Statement Of Financial Position [Abstract]
Trade accounts receivable, net of allowance	$ 951	$ 1,453
Non current financing receivables, net of allowance	$ 0	$ 1,849
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	13,630,666	13,600,541
Common stock, shares outstanding	13,630,666	13,600,541