Inventories - Net Inventories (Detail) - USD ($)	Mar. 31, 2017	Sep. 30, 2016
Inventory, Net [Abstract]
Raw materials	$ 7,924,000	$ 7,072,000
Work in process	1,787,000	976,000
Finished goods	4,846,000	3,545,000
Used equipment	41,000	41,000
Inventories, net	$ 14,598,000	$ 11,634,000