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Loan Payable (Details) - SVB - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Aug. 31, 2015
Loan Payable      
Line of credit maximum     $ 2,000,000
Amount borrowed   $ 400,000 $ 2,000,000
Interest expense $ 27,000 $ 100,000