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Stockholders' Equity (Schedule of Fair Value of Employee Stock Purchase Plan) (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Dividend yield     0.00%  
ESPP [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected volatility 97.00% 67.00%    
Risk-free interest rate, minimum 3.34% 0.06%   0.06%
Risk-free interest rate, maximum 3.51% 0.20%   0.20%
Weighted average grant date fair value, Granted $ 3.40 $ 16.73 $ 4.28 $ 25.07
ESPP [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years 6 months 6 months 6 months 6 months
Expected volatility     70.00% 67.00%
ESPP [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years 2 years 2 years 2 years 2 years
Expected volatility     97.00% 68.00%