Inventories - Inventories (Detail) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 17,937,000	$ 16,865,000
Work in process	4,504,000	4,584,000
Finished goods	3,245,000	4,232,000
Gross inventory	25,686,000	25,681,000
Less: allowances	(1,964,000)	(2,084,000)
Inventories, net	$ 23,722,000	$ 23,597,000