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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
COMBINED AND CONSOLIDATED STATEMENTS OF LOSS AND COMPREHENSIVE LOSS
Interest expense on amount due to SINA	$ 0	$ 0	$ 2,838,000
Currency translation adjustments, tax	0	0	0
Change in unrealized loss from available-for-sale securities, tax	0	0	0
Reclassification adjustment for net loss included in net income (loss), tax	$ 0	$ 0	$ 0

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Amount of tax expense (benefit), before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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