Inventories - Schedule of Inventories, Net (Details) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 6,173,000	$ 10,571,000
Work-in-process	3,711,000	2,660,000
Finished goods	4,052,000	5,249,000
Sub-total inventories	13,936,000	18,480,000
Less reserve for slow moving and excess inventory	(886,000)	(3,727,000)
Total inventories, net	$ 13,050,000	$ 14,753,000