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Share-based Compensation Plans (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Jun. 30, 2022
USD ($)
TradingDay
$ / shares
shares
Jun. 30, 2021
USD ($)
shares
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Plans          
Share-based compensation $ 1,699,000 $ 2,340,000 $ 3,466,000 $ 4,652,000  
Expected period to recognize the expense     1 year 8 months 8 days    
Number of shares vested | shares 0 0 0 0  
Unrecognized share-based compensation expense | $ $ 100,000   $ 100,000    
outstanding stock options | shares 450,000   450,000    
weighted average exercise price | $ / shares $ 2.01   $ 2.01    
Restricted Stock Units          
Share-based Compensation Plans          
Unrecognized share-based compensation expense $ 400,000   $ 400,000    
Expected period to recognize the expense     10 months 24 days    
Stock options          
Share-based Compensation Plans          
Share-based compensation 0 $ 0 $ 0 $ 0  
Unrecognized share-based compensation expense $ 6,400,000   $ 6,400,000    
Expected period to recognize the expense     3 years 3 months 18 days    
outstanding stock options | shares 8,413,315   8,413,315   7,080,426
weighted average exercise price | $ / shares $ 8.83   $ 8.83   $ 10.73
Performance stock options          
Share-based Compensation Plans          
Threshold consecutive trading days, used as a base for measurement of vesting of stock awards | TradingDay     30    
Performance stock options | Minimum [Member]          
Share-based Compensation Plans          
Expected option term (in years)     4 years    
Performance stock options | Maximum          
Share-based Compensation Plans          
Expected option term (in years)     4 years 7 months 6 days