Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Stockholders' Equity - Schedule of Assumptions Used in Black-Scholes-Merton Option-Pricing Model (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dividend yield 0.00% 0.00%
Minimum    
Expected stock volatility 86.30% 82.30%
Risk free interest rate 2.20% 2.20%
Expected years until exercise 2 years 9 months 18 days 2 years 2 months 12 days
Maximum    
Expected stock volatility 87.50% 87.50%
Risk free interest rate 2.30% 2.50%
Expected years until exercise 3 years 4 months 24 days 2 years 6 months