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Fair Value Measurements (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Fair Value of Financial Assets and Liabilities – Derivative Instruments [Abstract]        
Transfer of Liabilities From Level 1 to Level 2 $ 0      
Transfer of Liabilities From Level 2 to Level 1 0      
Transfer of Liabilities Into Level 3 0      
Transfer of Liabilities Out of Level 3 $ 0      
Derivative liability   $ 0 $ 1,157,000 $ 1,117,000