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Other income, net (Tables)
 12 Months Ended
Dec. 31, 2017
Other income, net [Abstract]  
Schedule of Other Income, Net
Continuing Operations
 
Years ended December 31,
 
(In thousands)
 
2015
 
2016
 
2017
 
Government subsidy income
 
 
1,902
 
 
2,358
 
 
2,788
 
Investment income from short-term investments
 
 
3,666
 
 
4,054
 
 
4,204
 
Dilution gains arising from deemed disposal of investment (note 11)
 
 
702
 
 
689
 
 
491
 
Investment income/loss on disposal of long-term investment (note 11)
 
 
—
 
 
626
 
 
(187)
 
Investment loss on impairment of long-term investment (note 11)
 
 
(802)
 
 
(1,654)
 
 
(596)
 
Exchange losses, net
 
 
(2,771)
 
 
(354)
 
 
(57)
 
Settlement income
 
 
755
 
 
326
 
 
533
 
Others
 
 
175
 
 
458
 
 
704
 
 
 
 
3,627
 
 
6,503
 
 
7,880