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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Secured convertible debentures $ 1,593,809
Proceeds investment agreement 6,193,000 6,500,000
Liabilities, fair value 6,193,000 8,093,809
Level 1 [Member]    
Secured convertible debentures
Proceeds investment agreement
Liabilities, fair value
Level 2 [Member]    
Secured convertible debentures
Proceeds investment agreement
Liabilities, fair value
Level 3 [Member]    
Secured convertible debentures 1,593,809
Proceeds investment agreement 6,193,000 6,500,000
Liabilities, fair value $ 6,193,000 $ 8,093,809