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Share-based Compensation - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options granted (in shares)   662,769 0 662,769
Grant date fair value (in dollars per share)       $ 2.91
Share-based compensation expense $ 2,100,000 $ 3,700,000 $ 3,800,000 $ 4,800,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense 8,300,000   $ 8,300,000  
Weighted average remaining period     1 year 8 months 9 days  
Stock Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining period     1 year 7 months 7 days  
Intrinsic value of options outstanding 0   $ 0  
Average remaining life of option outstanding     5 years 9 months 4 days  
Intrinsic value of exercisable options 0   $ 0  
Average remaining life of exercisable options     5 years 7 months 21 days  
Unrecognized unvested compensation expense $ 1,000,000   $ 1,000,000  
Unvested shares expected to vest (in shares) 454,493   454,493  
Weighted average remaining life     7 years 6 months 22 days  
Weighted average exercise price (in usd per share) $ 5.46   $ 5.46  
Intrinsic value $ 0   $ 0  
Omnibus Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock shares authorized to issue (in shares) 3,500,000   3,500,000