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Segment Information - Reconciliation of Segment Operating Profit (Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Operating Segments [Line Items]      
Segment operating profit/(loss) $ (264) $ 9,324 $ 12,440
Consolidated (264) 9,324 12,440
Other operating income 385 805 5,084
Other operating expenses (770) (1,445) (909)
Operating profit (649) 8,684 16,615
Finance costs (1,012) (1,378) (1,221)
Finance income 506 482 876
Share of loss of associates (3) (3) (3)
Loss on liquidation of a subsidiary     (261)
Exchange gain 1,550 1,741 2,784
Other income 717 1,817 214
Other expense (3) (11) (336)
Profit before tax 1,106 11,332 18,668
Operating segments [Member]      
Disclosure Of Operating Segments [Line Items]      
Segment operating profit/(loss) 2,620 12,467 15,514
Finance income 505 770 957
Profit before tax 1,106 11,332 18,668
Corporate expense adjustments and eliminations [Member]      
Disclosure Of Operating Segments [Line Items]      
Segment operating profit/(loss) (2,884) (3,143) (3,074)
Corporate expenses adjustments and eliminations (2,884) (3,143) (3,074)
Finance income 1 (288) (81)
Segment Reconciling Items [Member]      
Disclosure Of Operating Segments [Line Items]      
Other operating income 385 805 5,084
Other operating expenses (770) (1,445) (909)
Finance costs (1,012) (1,378) (1,221)
Finance income 506 482 876
Share of loss of associates (3) (3) (3)
Loss on liquidation of a subsidiary     (261)
Exchange gain 1,550 1,741 2,784
Other income 717 1,817 214
Other expense $ (3) $ (11) $ (336)