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Stock-Based Compensation - Evergreen provision (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
2019 Plan          
Number of Options          
Period of automatic increase in shares reserved       10 years  
Percentage of the common shares outstanding (as a percent)       4.00%  
Number of shares added (In shares) 35,549        
2019 Plan | Stock options          
Number of Options          
Vested   775 830 2,351 2,500
Forfeited, nonvested   0 1,056 2,000 9,798
2021 inducement plan and 2019 plan          
Unrecognized share-based compensation          
Unrecognized share-based compensation cost   $ 0.7   $ 0.7  
Unrecognized share-based compensation - Weighted average period       1 year 1 month 6 days  
2021 inducement plan and 2019 plan | Stock options          
Number of Options          
Aggregate maximum number of shares of common stock that may be issued   180,527   180,527  
Maximum | 2019 Plan          
Number of Options          
Aggregate maximum number of shares of common stock that may be issued   222,666   222,666