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Fair Value Measurements - Schedule of Financial Instruments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Short term investments | $ 29,427 us-gaap_ShortTermInvestments | $ 40,993 us-gaap_ShortTermInvestments
Fair value measurements, Total | 60,543 us-gaap_FairValueNetAssetLiability | 69,699 us-gaap_FairValueNetAssetLiability
Time deposits [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Cash equivalent, time deposits with original maturities less than three months | 31,117 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember | 30,892 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember
Fair value measurements, Short term investments |  | 9,695 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember
Investments in financial instruments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Short term investments |  | 31,298 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = xnet_FinancialInstrumentsMember
Fair value measurements, Short term investments | 29,426 us-gaap_ShortTermInvestments / us-gaap_FairValueByAssetClassAxis = xnet_FinancialInstrumentsMember |
Warrant liabilities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Warrant liabilities |  | (2,186)us-gaap_GuaranteesFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_WarrantMember
Significant other observable inputs (Level 2) [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Total | 60,543 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 69,699 us-gaap_FairValueNetAssetLiability / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant other observable inputs (Level 2) [Member] | Time deposits [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Cash equivalent, time deposits with original maturities less than three months | 31,117 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 30,892 us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair value measurements, Short term investments |  | 9,695 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_BankTimeDepositsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Significant other observable inputs (Level 2) [Member] | Investments in financial instruments [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Short term investments |  | 31,298 us-gaap_InvestmentsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = xnet_FinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair value measurements, Short term investments | 29,426 us-gaap_ShortTermInvestments / us-gaap_FairValueByAssetClassAxis = xnet_FinancialInstrumentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Significant other observable inputs (Level 2) [Member] | Warrant liabilities [Member] |  |
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items] |  |
Fair value measurements, Warrant liabilities |  | $ (2,186)us-gaap_GuaranteesFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = us-gaap_WarrantMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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