Quarterly report pursuant to Section 13 or 15(d)

Stock-based Expense - Narrative (Details)

v3.20.2
Stock-based Expense - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, reserved for awards (in shares) 12,800,000   12,800,000
Stock-based expense, capitalized $ 0.5   $ 0.9
Modern Message      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Quarterly vesting, percent     5.00%
Time-Based Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 68,646   973,773
Weighted average fair value (in dollars per share) $ 58.28   $ 59.86
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Restricted Stock | Modern Message      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 2 years 9 months    
Aggregate grant date fair value   $ 10.7  
Market Based Restricted Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 0    
Vesting period (in years) 1 year    
Aggregate grant date fair value     $ 13.5