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Stockholders' Equity (Schedule of Fair Value of Employee Stock Options) (Details) - Options to purchase common stock [Member] - $ / shares
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term in years 4 years 7 months 6 days 4 years 7 months 6 days
Expected volatility 70.00% 68.00%
Risk-free interest rate 1.76% 0.50%
Weighted average grant date fair value per share $ 6.66 $ 20.21