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Taxation - Summary of Net Operating Loss Carryforwards (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Net operating tax loss carryforwards expiration in 2015	$ 1,259xnet_NetOperatingTaxLossCarryforwardsExpirationInYearOne
Net operating tax loss carryforwards expiration in 2016	1,784xnet_NetOperatingTaxLossCarryforwardsExpirationInYearTwo
Net operating tax loss carryforwards expiration in 2017	1,971xnet_NetOperatingTaxLossCarryforwardsExpirationInYearThree
Net operating tax loss carryforwards expiration in 2018	9,638xnet_NetOperatingTaxLossCarryforwardsExpirationInYearFour
Net operating tax loss carryforwards expiration in 2019 and thereafter	9,857xnet_NetOperatingTaxLossCarryforwardsExpirationInYearFiveAndThereafter
Net operating tax loss carryforwards	$ 24,509us-gaap_TaxCreditCarryforwardAmount

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- Definition

The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Carryforwards

-URI http://asc.fasb.org/extlink&oid=6506874

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- Definition

Net operating tax loss carryforwards expiration in year five and thereafter.

+ References

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- Definition

Net Operating Tax Loss Carryforwards Expiration In Year Four

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Net Operating Tax Loss Carryforwards Expiration In Year One

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Net Operating Tax Loss Carryforwards Expiration In Year Three

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Net Operating Tax Loss Carryforwards Expiration In Year Two

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