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Revenue Deferred Revenue (Details) - USD ($)
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]    
Deferred revenue $ 5,545,000 $ 4,095,000
Revenue recognized 1,017,000  
Revenue recharacterized due to an amended contract 2,500  
Revenue expected to be recognized $ 578,000