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Other Income, Net - Schedule of Other Income, Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Income and Expenses [Abstract]
Subsidy income	$ 2,236xnet_SubsidyIncome	$ 1,393xnet_SubsidyIncome	$ 1,621xnet_SubsidyIncome
Fair value changes of warrants liabilities (note 14)	8,054us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings	1,531us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings	(710)us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings
Investment income from short-term investments	3,471us-gaap_InvestmentIncomeInterestAndDividend	1,847us-gaap_InvestmentIncomeInterestAndDividend	2us-gaap_InvestmentIncomeInterestAndDividend
Dilution gains arising from deemed disposal of investment (Note 10)	449us-gaap_EquityMethodInvestmentDeferredGainOnSale
Exchange losses	(176)us-gaap_ForeignCurrencyTransactionGainLossRealized	(252)us-gaap_ForeignCurrencyTransactionGainLossRealized	(351)us-gaap_ForeignCurrencyTransactionGainLossRealized
Others	(68)us-gaap_OtherIncome	160us-gaap_OtherIncome	2us-gaap_OtherIncome
Other income, net	$ 13,966us-gaap_OtherNonoperatingIncomeExpense	$ 4,679us-gaap_OtherNonoperatingIncomeExpense	$ 564us-gaap_OtherNonoperatingIncomeExpense

X

- Definition

This element represents disclosure of the amount of gain which has been deferred as the result of the sale of a business or operating assets to a highly leveraged entity which deferred gain has been reflected in the accompanying statement of financial position as reduction from the related asset.

+ References

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

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section U



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 40

-Section S99

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- Definition

Amount before tax of foreign currency transaction realized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

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X

- Definition

Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (a)

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- Definition

Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities.

+ References

Reference 1: 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(a),(b))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

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- Definition

Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Regulation S-X (SX)

-Number 210

-Section 04

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- Definition

The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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- Definition

Refers to the income that the government provided to the enterprise according to the provisions including value-added tax refund and others quota subsidy.

+ References

No definition available.

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