Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation - Assumptions Used (Details)

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Stock-based Compensation - Assumptions Used (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 5 years 7 months 6 days 5 years 7 months 6 days 5 years 4 months 24 days
Volatility 55.30% 60.00% 62.20%
Risk-free interest rate 2.40% 2.70% 2.00%
Expected dividend yield 0.00% 0.00% 0.00%
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life (years) 5 years 6 months 29 days 5 years 7 months 17 days 5 years 3 months 29 days
Volatility 55.80% 60.30% 62.30%
Risk-free interest rate 2.50% 2.70% 2.00%
Expected dividend yield 0.00% 0.00% 0.00%