Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Option pricing model (Details)

v3.22.1
Stockholders' Equity - Option pricing model (Details)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Stockholders' Equity    
Risk-free interest rate, Minimum 1.04% 0.65%
Risk-free interest rate, Maximum 1.50% 1.02%
Expected dividend yield 0.00% 0.00%
Expected term in years 10 years 10 years
Expected volatility, Minimum 100.65% 101.27%
Expected volatility, Maximum 102.71% 104.60%