XML 56 R59.htm IDEA: XBRL DOCUMENT v3.20.1
Stock-Based Compensation - Assumptions (Details) - shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Performance-based awards    
Valuation of Stock Option Grants to Employees    
Expected volatility, minimum 55.00%  
Expected volatility, maximum 65.00%  
Risk free interest rate, minimum 0.61%  
Risk free interest rate, maximum 1.64%  
Performance-based awards | Minimum    
Valuation of Stock Option Grants to Employees    
Expected term (years) 5 years 3 months  
Performance-based awards | Maximum    
Valuation of Stock Option Grants to Employees    
Expected term (years) 7 years 3 months  
Expected dividend yield 0.00%  
Employee and non-employee stock options    
Stock Based Compensation    
Options granted (in shares) 409,000  
Employee stock options    
Valuation of Stock Option Grants to Employees    
Expected volatility, minimum 49.94% 42.53%
Expected volatility, maximum 58.53% 42.75%
Expected dividend yield 0.00% 0.00%
Risk free interest rate, minimum 0.44% 2.26%
Risk free interest rate, maximum 1.70% 2.60%
Employee stock options | Minimum    
Valuation of Stock Option Grants to Employees    
Expected term (years) 5 years 3 months 7 days 5 years 3 months 29 days
Employee stock options | Maximum    
Valuation of Stock Option Grants to Employees    
Expected term (years) 10 years 5 years 6 months 10 days
Non-employee stock options    
Stock Based Compensation    
Options granted (in shares) 72,849  
Options unvested (in shares) 23,126