Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Assumptions Used in Black-Scholes-Merton Option-Pricing Model (Details)

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Stockholders' Equity - Schedule of Assumptions Used in Black-Scholes-Merton Option-Pricing Model (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Expected years until exercise 3 years 6 months   3 years 6 months  
Dividend yield 0.00% 0.00% 0.00% 0.00%
Minimum        
Expected stock volatility 86.20% 78.00% 82.30% 78.00%
Risk free interest rate 1.70% 2.60% 1.70% 2.10%
Expected years until exercise     1 year 2 years 6 months
Maximum        
Expected stock volatility 86.50% 79.30% 87.50% 86.30%
Risk free interest rate 1.80% 2.90% 2.60% 2.90%
Expected years until exercise     4 years 3 years 6 months