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)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity    
Dividend yield 0.00% 0.00%
Expected volatility 102.15% 96.26%
Risk-free interest rate 0.67% 0.52%
Expected lives (years) 5 years 7 months 6 days 5 years 4 months 24 days