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Share-based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options granted (in shares) 0 0
Share-based compensation expense $ 1,500,000 $ 1,300,000
Intrinsic value of options outstanding $ 0  
Average remaining life of option outstanding 5 years 3 days  
Intrinsic value of exercisable options $ 0  
Average remaining life of exercisable options 4 years 10 months 24 days  
Unvested shares expected to vest (in shares) 182,008  
Weighted average remaining life 7 years 4 months 9 days  
Weighted average exercise price (in usd per share) $ 5.45  
Intrinsic value $ 0  
Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 3,700,000  
Unrecognized compensation expense, period for recognition 1 year 1 month 6 days  
Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense $ 500,000  
Unrecognized compensation expense, period for recognition 11 months 15 days