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Stockholders' Equity (Weighted Average Assumptions) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend yield       0.01%  
Expected volatility       48.14%  
Risk-free interest rate 0.10% 0.09% 0.09%    
Expected holding period (years) 9 months 6 months 3 months    
Stock options | Black-Scholes          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       701,400 20,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value       $ 7.1  
Stock options | Monte-Carlo Pricing Model          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       150,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value       $ 1.7