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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