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Fair Value Measurements - Based Upon Sensitivity and Nature of Inputs (Details) - Derivative Warrant Liabilities [Member]
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Measurement Input, Price Volatility [Member]    
Fair Value Assumptions Rate 66.70% 70.61%
Measurement Input, Risk Free Interest Rate [Member]    
Fair Value Assumptions Rate 1.77% 2.53%
Measurement Input, Expected Term [Member]    
Fair Value Assumptions Expected Terms 3 years 10 months 17 days 4 years 4 months 17 days
Measurement Input, Expected Dividend Rate [Member]    
Fair Value Assumptions Rate 0.00% 0.00%