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Equity Incentive Plans - Company's Equity Incentive Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended
Feb. 27, 2018
Apr. 09, 2018
Jun. 30, 2018
Jun. 30, 2017
Aug. 27, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted     672,500    
Number of shares vested during the period     80,000    
Share based compensation     $ 5,011 $ 6,360  
Total unrecognised compensation cost relating to non-vested share option     263    
Total unrecognised compensation cost relating to restricted share awards     $ 3,771    
Weighted average remaining term for non-vested share option awards     1 year 9 months 15 days    
Weighted average remaining term for non-vested restricted share awards     9 months 4 days    
Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted   276,000      
Vesting date     Aug. 27, 2018    
Grant date fair value   $ 10.51      
Number of shares vested during the period         276,000
2018 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares reserved for issuance 700,000        
Number of shares granted 396,500        
Vesting date     Aug. 27, 2018    
Grant date fair value $ 12.49        
Number of shares vested during the period         253,500
2018 Equity Incentive Plan | Vest in February 27, 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted common shares expected to vest     71,500    
2018 Equity Incentive Plan | Vest in February 27, 2021          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted common shares expected to vest     71,500