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Stockholders' Equity (Schedule of Fair Value of Employee Stock Purchase Plan) (Details) - ESPP [Member] - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Risk-free interest rate, minimum 0.10% 0.10%  
Risk-free interest rate, maximum 0.20% 1.00%  
Weighted average grant date fair value, per share $ 25.07 $ 1.87  
Minimum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term in years 6 months 6 months 0 years
Expected volatility 67.00% 57.00%  
Maximum [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Expected term in years 2 years 2 years  
Expected volatility 68.00% 71.00%