Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Option pricing model (Details)

v3.21.1
Stockholders' Equity - Option pricing model (Details)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Stockholders' Equity    
Risk-free interest rate 1.04% 1.02%
Expected term in years 10 years 10 years
Expected volatility 102.71% 101.27%