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Stockholders' Equity (Schedule of Fair Value of Employee Stock Options) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years     5 years 1 month 6 days  
Stock Options [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected volatility 57.00%
Risk-free interest rate 1.20%
Dividend yield