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Changes in Accounting Policies - Summary of Changes in Accounting Policies Adjustments Recognized for Each Individual Line Item (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Non-current liabilities        
Long-term debt $ 32,445 $ 36,020 $ 35,760  
Total liabilities 59,119 61,558 61,298  
SHAREHOLDERS' EQUITY        
Retained earnings 33,867 39,012 39,272  
Total shareholders' equity $ 100,696 $ 80,783 81,043 $ 67,387
Adjustment for adoption of IFRS 9 [member]        
Non-current liabilities        
Long-term debt     260  
Total liabilities     260  
SHAREHOLDERS' EQUITY        
Retained earnings     (260)  
Total shareholders' equity     $ (260)