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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value Inputs (Details)
6 Months Ended
Jun. 30, 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Expected volatility 92.90%
Expected life of options (in years) 6 years 2 months 12 days
Warrant  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Risk free interest rate, minimum 0.24%
Risk free interest rate, maximum 0.26%
Minimum | Warrant  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Expected volatility 100.17%
Expected life of options (in years) 4 years 14 days
Maximum | Warrant  
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]  
Expected volatility 100.27%
Expected life of options (in years) 4 years 6 months 14 days