Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Option Awards, assumptions (Details)

v3.22.1
Stock-Based Compensation - Option Awards, assumptions (Details) - Stock Options - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercise price minimum $ 2.61 $ 6.44
Exercise price maximum $ 3.10 $ 23.41
Risk-free rate of interest, minimum 1.80% 0.69%
Risk-free rate of interest, maximum 2.56% 1.45%
Expected stock price volatility 82.80%  
Dividend yield 0.00% 0.00%
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term (years) 5 years 6 months 5 years 3 months
Expected stock price volatility   80.00%
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected term (years) 6 years 6 months 6 years 6 months
Expected stock price volatility   85.90%