CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Current assets:
Trade receivables, allowances for doubtful accounts	$ 243	$ 37
Stockholders' equity:
Convertible preferred stock, par value (in dollars per share)	$ 0.10	$ 0.10
Convertible preferred stock, authorized (in shares)	1,000,000	1,000,000
Convertible preferred stock, outstanding (in shares)	448,705	452,124
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, shares outstanding (in shares)	5,341,513	3,694,872