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Property and Equipment (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Total Property and Equipment $ 33,074,000 $ 32,562,000
Less: Accumulated Depreciation (23,078,000) (21,634,000)
Property and Equipment, net 9,996,000 10,928,000
Leasehold Improvements [Member]    
Total Property and Equipment $ 997,000 997,000
Property Plant And Equipment Useful Life Term of Lease  
Machinery and Equipment [Member]    
Total Property and Equipment $ 13,430,000 13,414,000
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 $ 9,029,000 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 $ 443,000 438,000
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 $ 519,000 519,000
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