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Summary of Significant Accounting Policies Stock-Based Compensation (Details 1)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Outstanding, Weighted Average Remaining Vesting Period 1 year 1 month 6 days    
Equity Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Employees 4 years 4 years 4 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Employee 1.30% 2.20% 2.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected VolatilityRate, Employees 98.00% 88.00% 58.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate, Employees 0.00% 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Officers and Non-employee Directors 1.40% 2.60% 2.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Officers and Non-employee Directors 85.00% 77.00% 63.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate, Officers and Non-employee Directors 0.00% 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Officers and Non-employee Directors 7 years 8 years 8 years