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Equity Instruments and Share-Based Compensation - Fair Value Assumptions (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 2 years 4 months 13 days    
Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (in years) 6 years 3 months 6 years 3 months 6 years 3 months
Expected volatility 56.48% 56.59% 58.82%
Risk-free interest rate 2.52% 2.68% 2.20%
Expected dividend yield 0.00% 0.00% 0.00%