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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 12 Months Ended
Jun. 13, 2023
Jun. 14, 2022
Jun. 30, 2023
Jan. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Oct. 31, 2020
Stock-based compensation                
Common stock, shares issued         1,058,892 628,139    
Remaining unrecognized compensation cost of non-vested stock options         $ 1.0      
Weighted-average remaining requisite service period of recognition of unrecognized compensation cost         1 year 6 months 10 days      
Minimum                
Stock-based compensation                
Stock awards vesting period         3 years      
Maximum                
Stock-based compensation                
Stock awards vesting period         4 years      
Employee Stock Option [Member]                
Stock-based compensation                
Options granted (in shares)         43,342 34,822    
Options granted, grant date fair value         $ 6.63 $ 26.44    
Options exercised (in shares)         0 0    
Employee Stock Option [Member] | Minimum                
Stock-based compensation                
Options granted, grant date fair value         $ 6.32 $ 12.45    
Employee Stock Option [Member] | Maximum                
Stock-based compensation                
Options granted, grant date fair value         $ 10.98 $ 43.50    
Employee Stock Option [Member] | Options Vesting On Third Anniversary Of Grant [Member]                
Stock-based compensation                
Stock awards vesting period         3 years      
Options granted (in shares)         25,633      
Restricted Stock Units (RSUs)                
Stock-based compensation                
Stock awards vesting period       3 years        
Options granted, grant date fair value     $ 8.84          
Restricted Stock Units, Granted     8,488 17,133 25,621 7,911    
Restricted stock units, grant date fair value       $ 13.50 $ 16.26 $ 28.20 $ 100.35  
Restricted stock units         300      
Granted         $ 11.96 $ 16.65    
Restricted Stock Units (RSUs) | Employees                
Stock-based compensation                
Stock awards vesting period           3 years    
Modified Stock Options And Restricted Stock Units                
Stock-based compensation                
Restricted Stock Units, Granted         25,621      
2018 Equity Incentive Plan (the "2018 Plan") [Member]                
Stock-based compensation                
Number of additional shares authorized 60,000 33,333            
Number of shares reserved for issuance         25,415      
Life of stock option awards granted         10 years      
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Minimum                
Stock-based compensation                
Stock awards vesting period         1 year      
2018 Equity Incentive Plan (the "2018 Plan") [Member] | Maximum                
Stock-based compensation                
Stock awards vesting period         4 years      
Inducement Equity Incentive Plan 2020 [Member]                
Stock-based compensation                
Number of authorized shares               13,333
Number of shares reserved for issuance         5,333      
Common stock, shares issued         8,000