Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Stock Option Valuation Assumptions (Details)

v3.21.2
Stockholders' Equity - Stock Option Valuation Assumptions (Details)
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Stockholders' Equity    
Dividend yield 0.00% 0.00%
Expected volatility 101.43% 89.61%
Risk-free interest rate 0.43% 0.86%
Expected lives (years) 5 years 6 months 5 years 10 months 24 days