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Revenue Recognition (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total Net Sales $ 4,491,000 $ 4,654,000 $ 12,561,000 $ 15,636,000
Products and Services Transferred Over Time        
Total Net Sales 2,031,000 3,401,000 7,392,000 11,099,000
Products and Services Transferred at a Point in Time        
Total Net Sales 246,000 1,253,000 5,169,000 4,537,000
Services        
Total Net Sales 4,373,000 4,400,000 11,983,000 14,474,000
Services | Products and Services Transferred Over Time        
Total Net Sales 2,031,000 3,401,000 7,392,000 11,099,000
Services | Products and Services Transferred at a Point in Time        
Total Net Sales 2,342,000 999,000 4,591,000 3,375,000
Products        
Total Net Sales 118,000 254,000 578,000 1,162,000
Products | Products and Services Transferred Over Time        
Total Net Sales 0 0 0 0
Products | Products and Services Transferred at a Point in Time        
Total Net Sales $ 118,000 $ 254,000 $ 578,000 $ 1,162,000