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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)

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