Consolidated Statements of Comprehensive income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues, net of rebates and discounts	$ 182,887us-gaap_SalesRevenueGoodsNet	$ 180,244us-gaap_SalesRevenueGoodsNet	$ 148,200us-gaap_SalesRevenueGoodsNet
Business taxes and surcharges	(3,358)us-gaap_ExciseAndSalesTaxes	(5,650)us-gaap_ExciseAndSalesTaxes	(7,679)us-gaap_ExciseAndSalesTaxes
Net revenues	179,529us-gaap_SalesRevenueNet	174,594us-gaap_SalesRevenueNet	140,521us-gaap_SalesRevenueNet
Cost of revenues	(98,459)us-gaap_CostOfRevenue	(93,260)us-gaap_CostOfRevenue	(84,012)us-gaap_CostOfRevenue
Gross profit	81,070us-gaap_GrossProfit	81,334us-gaap_GrossProfit	56,509us-gaap_GrossProfit
Operating expenses
Research and development expenses	(35,287)us-gaap_ResearchAndDevelopmentExpense	(28,832)us-gaap_ResearchAndDevelopmentExpense	(20,357)us-gaap_ResearchAndDevelopmentExpense
Sales and marketing expenses	(29,253)us-gaap_SellingAndMarketingExpense	(26,610)us-gaap_SellingAndMarketingExpense	(20,219)us-gaap_SellingAndMarketingExpense
General and administrative expenses	(29,960)us-gaap_GeneralAndAdministrativeExpense	(23,073)us-gaap_GeneralAndAdministrativeExpense	(18,474)us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	(94,500)us-gaap_OperatingExpenses	(78,515)us-gaap_OperatingExpenses	(59,050)us-gaap_OperatingExpenses
Net gain from exchanges of content copyrights	1,556	1,020	4,666
Operating income / (loss)	(11,874)us-gaap_OperatingIncomeLoss	3,839us-gaap_OperatingIncomeLoss	2,125us-gaap_OperatingIncomeLoss
Interest income	6,733us-gaap_InterestIncomeOther	1,189us-gaap_InterestIncomeOther	1,377us-gaap_InterestIncomeOther
Interest expense	(163)us-gaap_InterestExpenseDebt		(1,400)us-gaap_InterestExpenseDebt
Other income, net	13,966us-gaap_OtherNonoperatingIncomeExpense	4,679us-gaap_OtherNonoperatingIncomeExpense	564us-gaap_OtherNonoperatingIncomeExpense
Share of (loss) / income from an equity investee	(259)	25	(45)
Income before income tax	8,403	9,732	2,621
Income tax benefit / (expense)	1,459us-gaap_IncomeTaxExpenseBenefit	647us-gaap_IncomeTaxExpenseBenefit	(2,239)us-gaap_IncomeTaxExpenseBenefit
Net income	9,862us-gaap_ProfitLoss	10,379us-gaap_ProfitLoss	382us-gaap_ProfitLoss
Less: net loss attributable to the non-controlling interest	(950)	(283)	(121)
Net income attributable to Xunlei Limited	10,812us-gaap_NetIncomeLoss	10,662us-gaap_NetIncomeLoss	503us-gaap_NetIncomeLoss
Net income attributable to shareholders
Allocation of net income to participating preferred shareholders		(4,094)
Acceleration of amortization of beneficial conversion feature	(49,346)
Deemed dividend to certain shareholders from repurchase of shares	(14,926)
Deemed dividend to preferred shareholders upon initial public offering	(32,807)
Net (loss) / income attributable to Xunlei Limited's common shareholders	(105,366)	2,268	(313)
Net income	9,862us-gaap_ProfitLoss	10,379us-gaap_ProfitLoss	382us-gaap_ProfitLoss
Other comprehensive income / (loss): Foreign currency translation adjustment, net of tax	(114)	2,775	490
Comprehensive income	9,748	13,154	872
Less: comprehensive income attributable to non-controlling interest shareholders	(955)	(276)	(120)
Comprehensive income attributable to Xunlei Limited	10,703us-gaap_ComprehensiveIncomeNetOfTax	13,430us-gaap_ComprehensiveIncomeNetOfTax	992us-gaap_ComprehensiveIncomeNetOfTax
Basic net (loss) / income per share attributable to Xunlei Limited	$ (0.54)us-gaap_EarningsPerShareBasic	$ 0.04us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic
Weighted average number of common shares outstanding-basic	194,711,227	61,447,372	61,447,372
Diluted net (loss) / income per share attributable to Xunlei Limited	$ (0.54)us-gaap_EarningsPerShareDiluted	$ 0.01us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding-diluted	194,711,227	76,065,898	61,447,372
Series C [Member]
Net income attributable to shareholders
Beneficial Conversion Feature of convertible preferred shares from their modifications			(286)
Deemed contribution			2,979
Series D Preferred Stock [Member]
Net income attributable to shareholders
Deemed dividend to shareholder from its modification	(279)
Accretion to convertible redeemable preferred shares redemption value	(1,870)	(4,300)	(3,509)
Series C To One Series C [Member]
Net income attributable to shareholders
Contingent beneficial conversion feature	(57)
Series E Preferred Shares [Member]
Net income attributable to shareholders
Accretion to convertible redeemable preferred shares redemption value	(12,754)
Amortization of beneficial conversion feature	(4,139)
Acceleration of amortization of beneficial conversion feature	$ (49,346)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Other Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=6519514

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Comprehensive Income

-URI http://asc.fasb.org/extlink&oid=35737396

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256