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Subsequent Events (Details) - shares
1 Months Ended 12 Months Ended
Feb. 29, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock options      
Subsequent Events      
Stock options granted   592,500 90,000
Restricted stock units      
Subsequent Events      
Number of awards granted other than options   75,000  
Deferred stock units      
Subsequent Events      
Number of awards granted other than options   30,000  
Subsequent Event | Stock options      
Subsequent Events      
Stock options granted 30,000    
Subsequent Event | Restricted stock units      
Subsequent Events      
Number of awards granted other than options 245,000    
Subsequent Event | Deferred stock units      
Subsequent Events      
Number of awards granted other than options 15,000