Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Details)

v3.19.2
Stock Options - Summary of Assumptions Used Principally in Determining Fair Value of Options Granted (Details)
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term in years 6 years 2 months 30 days  
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk free interest rate 2.56% 2.40%
Expected dividend yield 0.00% 0.00%
Expected term in years 6 years 2 months 30 days 6 years 2 months 30 days
Expected volatility 87.70% 87.90%