Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - (Narrative) (Details)

v3.20.1
Stock-Based Compensation - (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation expense $ 2,475 $ 5,631
Dividend rate used 0.00%  
Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to unvested options $ 9,100  
Weighted average period for compensation cost to be recognized 2 years 2 months 12 days  
RSA/RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost related to unvested restricted shares $ 21,500  
Weighted average period for compensation cost to be recognized 2 years 2 months 12 days  
RSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding units (in shares) 481,000  
Series B common stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted (in shares) 0  
Shares reserved for issuance upon exercise (in shares) 1,200,000  
Series A common stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted (in shares) 507,000  
Shares reserved for issuance upon exercise (in shares) 1,100,000  
CEO | Series B common stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options, weighted average GDFV (in dollars per share) $ 16.60  
CEO | Series B common stock | CEO Annual Award    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted (in shares) 148,000  
Options, weighted average GDFV (in dollars per share) $ 13.21  
CEO | Series B common stock | CEO New Employment Agreement    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of options granted (in shares) 359,000