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Share Based Payments - Additional Information (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Aug. 08, 2018
USD ($)
Apr. 01, 2018
USD ($)
Dec. 31, 2017
shares
Jun. 30, 2017
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
$ / shares
shares
May 15, 2018
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock shares available for issuance             3,000,000
Number of stock option issued         1,011,406 868,902  
Stock option forfeited         53,503 153,067  
Fair value of options recorded in stock based compensation liability | $   $ 10.0          
Reclassification of equity-classified stock options to stock-based compensation liability due to change in functional currency | $   $ 4.2          
Reduction to stock-based compensation liability | $ $ 0.3            
Reclassified from liability to equity | $ $ 10.3            
Weighted average exercise price | (per share)         $ 10.12 $ 11.15  
Employee and Director Stock Options              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of stock option issued         996,406 673,902  
Stock option forfeited         53,503    
Unrecognized compensation cost related to non-vested stock options outstanding | $         $ 8.3    
Weighted-average remaining vesting period         3 years    
Weighted average exercise price | (per share)         $ 10.12 $ 10.87  
Weighted average grant date fair value | (per share)         $ 7.78 $ 4.34  
Consultants Stock Option              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Number of stock option issued         15,000 195,000  
Unrecognized compensation cost related to non-vested stock options outstanding | $         $ 0.1    
Weighted-average remaining vesting period         2 years 7 months 6 days    
Weighted average exercise price | (per share)         $ 10.23 $ 12.20  
Weighted average grant date fair value | (per share)         $ 8.87 $ 3.88  
2018 Omnibus Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock shares authorized and approved to issue under plan             5,356,114
Common stock remaining available for grant         4,775,711    
2016 Omnibus Incentive Plan              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Common stock shares available for issuance             2,356,114
2016 Omnibus Incentive Plan | Common Stock              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Aggregate amount of stock excess award     60,000        
2016 Omnibus Incentive Plan | Restricted Stock Units              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Vesting period       3 years      
Vesting percentage       25.00%