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Stockholders' Equity (Schedule of Fair Value of Employee Stock Purchase Plan) (Details) - ESPP [Member] - $ / shares
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected volatility 68.00% 57.00%
Risk-free interest rate, minimum 0.07% 0.80%
Risk-free interest rate, maximum 0.13% 1.00%
Dividend yield
Weighted average grant date fair value, Granted $ 29.26 $ 1.62
Minimum [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term in years 6 months 6 months
Maximum [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term in years 2 years 2 years