Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Narrative (Details)

v3.19.1
Stock-Based Compensation - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jan. 31, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted during period (shares)   2,500,000      
Stock-based compensation expense   $ 2,751,000   $ 9,886,000  
Award vesting period   3 years 3 years    
Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted during period (shares) 140,844   57,145    
Fair value of grants (USD per share) $ 4.26   $ 8.75    
Stock-based compensation expense   $ 166,000   0  
Restricted stock awards | Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized compensation costs   $ 500,000      
Award vesting period   11 months      
Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted during period (shares)   897,967 476,042    
Number of awards forfeited during period (shares)   13,000      
Fair value of grants (USD per share)   $ 10.65     $ 15.74
Stock-based compensation expense   $ 2,131,000   9,886,000  
Unamortized compensation costs   $ 18,300,000   18,400,000  
Award vesting period   2 years 4 months 6 days      
Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted during period (shares)   323,000      
Number of awards forfeited during period (shares)   1,000      
Fair value of grants (USD per share)   $ 4.29     $ 5.49
Stock-based compensation expense   $ 454,000   0  
Unamortized compensation costs   $ 2,300,000   0  
Award vesting period   2 years 7 months 29 days      
Selling, General and Administrative Expenses | Restricted stock awards          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 200,000   0  
Selling, General and Administrative Expenses | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   2,100,000   9,900,000  
Selling, General and Administrative Expenses | Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 500,000   $ 0  
2018 | Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of awards granted during period (shares)   323,483 425,083    
Number of awards forfeited during period (shares)     297,558    
Number of awards earned during period (shares)     127,525    
Number of awards awarded during period (shares)   646,966      
Number of awards awarded but not yet considered granted in period (shares)   323,483      
Year 1 | 2018 | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting percentage     33.00%    
Year 2 | 2018 | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting percentage     33.00%    
Year 3 | 2018 | Restricted stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Annual vesting percentage     33.00%