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Fair Value Measurement - Estimated Fair Values of Liabilities Measured on Recurring Basis (Details) - USD ($)
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Inputs, Level 1 [Member]    
Derivative Liability, Noncurrent $ 0 $ 0
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]    
Derivative Liability, Noncurrent 0 0
Fair Value, Inputs, Level 2 [Member]    
Derivative Liability, Noncurrent 0 0
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]    
Derivative Liability, Noncurrent 0 0
Fair Value, Inputs, Level 3 [Member]    
Derivative Liability, Noncurrent 1,645,606 298,092
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]    
Derivative Liability, Noncurrent $ 1,645,606 $ 298,092