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Property and Equipment (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Total Property and Equipment $ 30,623,000 $ 29,993,000
Less: Accumulated Depreciation (21,985,000) (19,943,000)
Property and Equipment, net 8,638,000 10,050,000
Leasehold Improvements [Member]    
Total Property and Equipment $ 528,000 528,000
Property Plant And Equipment Useful Life Term of Lease  
Machinery and Equipment [Member]    
Total Property and Equipment $ 11,590,000 11,554,000
Machinery and Equipment [Member] | Minimum    
Property plant and equipment useful life 5 years  
Machinery and Equipment [Member] | Maximum [Member]    
Property plant and equipment useful life 8 years  
Capital Lease Machinery and Equipment [Member]    
Total Property and Equipment $ 6,534,000 6,534,000
Capital Lease Machinery and Equipment [Member] | Minimum    
Property plant and equipment useful life 5 years  
Capital Lease Machinery and Equipment [Member] | Maximum [Member]    
Property plant and equipment useful life 8 years  
Tools and Instruments [Member]    
Total Property and Equipment $ 9,124,000 8,538,000
Tools and Instruments [Member] | Minimum    
Property plant and equipment useful life 1 year 6 months  
Tools and Instruments [Member] | Maximum [Member]    
Property plant and equipment useful life 7 years  
Furniture and Fixtures [Member]    
Total Property and Equipment $ 316,000 311,000
Furniture and Fixtures [Member] | Minimum    
Property plant and equipment useful life 5 years  
Furniture and Fixtures [Member] | Maximum [Member]    
Property plant and equipment useful life 8 years  
Computers and Software [Member]    
Total Property and Equipment $ 409,000 406,000
Computers and Software [Member] | Minimum    
Property plant and equipment useful life 4 years  
Computers and Software [Member] | Maximum [Member]    
Property plant and equipment useful life 6 years  
Automotive Equipment [Member]    
Total Property and Equipment $ 172,000 172,000
Property plant and equipment useful life 5 years  
Buildings and Improvements [Member]    
Total Property and Equipment $ 1,650,000 1,650,000
Property plant and equipment useful life 31 years 6 months  
Land [Member]    
Total Property and Equipment $ 300,000 $ 300,000