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Other Income, Net - Schedule of Other Income, Net (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Government subsidy income | $ 2,788 |  | $ 2,358 |  | $ 1,902
Deemed disposal gain on long-term investments | (491) |  | (689) |  | (702)
Investment income/loss on disposal of long-term investment | (1,875) | [1] | (195) | [1] | (12)
Investment loss on impairment of long-term investment | (596) |  | (1,654) |  | (802)
Exchange losses, net | (57) |  | (354) |  | (2,771)
Settlement income | 533 |  | 326 |  | 755
Others | 704 |  | 458 |  | 175
Other income, net | 7,880 |  | 6,503 |  | 3,627
Short-term Investments [Member] |  |  |  |  |
Investment income/loss on disposal of long-term investment | 4,204 |  | 4,054 |  | 3,666
Other Long-term Investments [Member] |  |  |  |  |
Investment income/loss on disposal of long-term investment | $ (187) |  | $ 626 |  | $ 0
[1] | In 2016, the Group made an equity investment in a privately-held company, Big Data, of USD 1,442,000 for 43.16% equity interest. The Group classified Big Data as an equity method investment as it had only significant influence instead of control over Big Data. In January of 2017, Big Data issued certain new shares to a third party and its original shareholders and the Group’s interest in Big Data diluted from 43.16% to 28.77% with a dilution gain of USD 326,000 arising from the deemed disposal. As at December 31, 2017, the Group recognized full impairment of USD 1,251,000 for its interest in Big Data as share of loss from equity investees after taking into account the latest operation status and financial position of Big Data.

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- Definition This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=99375318&loc=d3e32787-111569 + Details
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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c)-(e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(c),9(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 + Details
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