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Stock Options and Restricted Stock Units - Weighted Average Fair Values and Assumptions (Details) - $ / shares
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted average fair value of options granted (in dollars per share) $ 3.10 $ 3.33
Expected volatility factor   59.62%
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 1.94% 0.22%
Expected life (years) 3 years 3 years
Expected volatility factor 62.00%  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate 2.75% 0.82%
Expected life (years) 6 years 5 months 1 day 6 years
Expected volatility factor 76.48%