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Segment Information - Reconciliation of Segment Gross Profit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Operating Segments [Line Items]      
Gross profit $ 39,688 $ 31,608 $ 23,489
Other operating income 5,084 5,441 1,140
Selling, general and administrative expenses (27,248) (26,325) (27,007)
Other operating expenses (909) (3,386) (332)
Operating profit/(loss) 16,615 7,338 (2,710)
Finance costs (1,221) (1,147) (1,547)
Finance income 876 1,045 697
Share of loss of associates (3) (710) (801)
Impairment of investment in associates   (126)  
Loss on liquidation of subsidiary (261)    
Exchange gain / (loss) 2,784 (38) (4,223)
Other income 214 267 119
Other expense (336) (94) (180)
Profit/(loss) before tax 18,668 6,535 (8,645)
Operating segments [Member]      
Disclosure Of Operating Segments [Line Items]      
Gross profit 39,688 31,608 23,489
Operating profit/(loss) 16,615 7,338 (2,710)
Finance income 957 1,153 713
Profit/(loss) before tax 18,668 6,535 (8,645)
Segment Reconciling Items [Member]      
Disclosure Of Operating Segments [Line Items]      
Other operating income 5,084 5,441 1,140
Selling, general and administrative expenses (27,248) (26,325) (27,007)
Other operating expenses (909) (3,386) (332)
Finance costs (1,221) (1,147) (1,547)
Finance income 876 1,045 697
Share of loss of associates (3) (710) (801)
Impairment of investment in associates   (126)  
Loss on liquidation of subsidiary (261)    
Exchange gain / (loss) 2,784 (38) (4,223)
Other income 214 267 119
Other expense $ (336) $ (94) $ (180)