Annual report pursuant to Section 13 and 15(d)

Stock-Based Payments - Stock Options (Details)

v3.19.3.a.u2
Stock-Based Payments - Stock Options (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unrecognized compensation costs $ 12.0    
Period in which compensation costs will be recognized 2 years 7 months 6 days    
Granted and outstanding (in shares) 1,175,500    
Intrinsic value of options exercised $ 0.2 $ 1.4 $ 4.6
Cash received from option exercises 0.2 0.6 $ 1.8
Performance-based stock options      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Additional stock-based compensation expense recorded related to achievement of certain performance-based milestones 0.4 $ 0.2  
Unrecognized compensation costs $ 0.4    
Period in which compensation costs will be recognized 2 years 10 months 24 days    
Performance-based stock options | Advisor      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unrecognized compensation costs $ 0.3    
Period in which compensation costs will be recognized 6 years 8 months 12 days    
Granted and outstanding (in shares) 75,000