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Taxation - Schedule of Movement of Valuation Allowance (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Beginning balance   $ (43)us-gaap_DeferredTaxAssetsValuationAllowance $ (37)us-gaap_DeferredTaxAssetsValuationAllowance
Additions (291)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount   (6)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Write-off   43xnet_ValuationAllowanceDeferredTaxAssetWriteOff  
Ending balance $ (291)us-gaap_DeferredTaxAssetsValuationAllowance   $ (43)us-gaap_DeferredTaxAssetsValuationAllowance