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Acquisitions - Changes in the Group's Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Changes in the Group's goodwill by segment |  |
Balance at the beginning of the year | $ 11,117 | $ 11,652
Currency translation adjustment | (851) | (535)
Balance at the end of the year | 10,266 | 11,117
Impairment of goodwill | 0 |
Advertising & Marketing |  |
Changes in the Group's goodwill by segment |  |
Balance at the beginning of the year | 0 | 0
Currency translation adjustment | 0 | 0
Balance at the end of the year | 0 | 0
Other |  |
Changes in the Group's goodwill by segment |  |
Balance at the beginning of the year | 11,117 | 11,652
Currency translation adjustment | (851) | (535)
Balance at the end of the year | $ 10,266 | $ 11,117

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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