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Revenue Recognition (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Services revenues                 $ 20,229,000 $ 31,623,000
Products revenues                 1,725,000 1,613,000
Total Net Sales $ 6,318,000 $ 4,654,000 $ 5,842,000 $ 5,140,000 $ 8,117,000 $ 9,455,000 $ 8,245,000 $ 7,419,000 21,954,000 33,236,000
Products and services transferred over time                    
Services revenues                 15,172,000 28,598,000
Products revenues                 0 0
Total Net Sales                 15,172,000 28,598,000
Products and services transferred at a point in time                    
Services revenues                 5,057,000 3,025,000
Products revenues                 1,725,000 1,613,000
Total Net Sales                 $ 6,782,000 $ 4,638,000