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Subsequent Events - Additional Information (Details) - shares
1 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Subsequent Event [Line Items]      
Forfeit options   67,327 43,841
Share option stock grant   556,396 1,096,881
President      
Subsequent Event [Line Items]      
Share option stock grant   500,000  
President | Subsequent Event      
Subsequent Event [Line Items]      
Forfeit options 375,000    
Restricted Stock Units | President | Subsequent Event      
Subsequent Event [Line Items]      
Share-based compensation, number of stock unit grants in period 12,500    
Vesting period 3 years    
Performance-based Stock Units | President | Subsequent Event      
Subsequent Event [Line Items]      
Share-based compensation, number of stock unit grants in period 12,500    
Performance-based Stock Units | President | Subsequent Event | Tranche One      
Subsequent Event [Line Items]      
Compound annual growth rate, measurement period 2 years    
Performance-based Stock Units | President | Subsequent Event | Tranche Two      
Subsequent Event [Line Items]      
Compound annual growth rate, measurement period 3 years