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Share-Based Payments - Employee Stock Purchase Plan (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 8 Months Ended 12 Months Ended
Aug. 31, 2018
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Share-Based Payments            
Share-based compensation expense     $ 3,728 $ 2,011    
Employee Stock Purchase Plan            
Share-Based Payments            
Maximum number of shares authorized under plan (in shares) 500,000          
ESPP Share Pool as a percentage of total number of ordinary shares outstanding           0.75%
Purchase discount as a percentage of current market price     15.00%      
Number of shares purchased by eligible employees         92,331  
Share-based compensation expense   $ 100 $ 100