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Equity - Share Repurchase Program (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 07, 2018
Aug. 03, 2018
Dec. 31, 2018
Equity [abstract]      
Period of contract with brokers to purchase its ordinary shares   5 years  
Maximum percentage of issued ordinary shared acquired by brokers   10.00%  
Minimum share price   $ 0.01  
Maximum price as percentage above average volume weighted average price   5.00%  
Number of business days prior to purchase used to calculate average volume weighted average price   5 days  
Authorised repurchase amount     $ 20,000
Number of shares acquired 2,894,049    
Total consideration $ 20,100   $ 20,100
Stamp duty $ 100    
Average price paid per share $ 6.89    
Purchased and cancelled     1,152,958
Ordinary shares purchased into treasury     1,741,091