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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Proceeds investment agreement $ 6,417,000 $ 9,142,000
Secured convertible notes 1,606,305
Liabilities, fair value 8,023,305 9,142,000
Level 1 [Member]    
Proceeds investment agreement
Secured convertible notes  
Liabilities, fair value  
Level 2 [Member]    
Proceeds investment agreement
Secured convertible notes  
Liabilities, fair value  
Level 3 [Member]    
Proceeds investment agreement 6,417,000 $ 9,142,000
Secured convertible notes 1,606,305  
Liabilities, fair value $ 8,023,305