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Acquisitions Fair value of assets acquired and liabilities (Details) (USD $)
3 Months Ended 8 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
May 08, 2014
Business Acquisition [Line Items]                          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                         $ 51,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment                         1,041,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other                         201,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                         13,901,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
Common Stock, Shares, Issued                         5,329,593us-gaap_CommonStockSharesIssued
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High                         90,000,000us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net                         19,400,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Business Acquisition, Transaction Costs                         33,500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Goodwill 25,209,336us-gaap_Goodwill       11,117,770us-gaap_Goodwill       25,209,336us-gaap_Goodwill 25,209,336us-gaap_Goodwill 11,117,770us-gaap_Goodwill   14,092,000us-gaap_Goodwill
Equity Issued in Business Combination, Fair Value Disclosure                         21,600,000us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure
Business Combination, Contingent Consideration, Liability 18,260,000us-gaap_BusinessCombinationContingentConsiderationLiability       9,450,000us-gaap_BusinessCombinationContingentConsiderationLiability       18,260,000us-gaap_BusinessCombinationContingentConsiderationLiability 18,260,000us-gaap_BusinessCombinationContingentConsiderationLiability 9,450,000us-gaap_BusinessCombinationContingentConsiderationLiability   11,900,000us-gaap_BusinessCombinationContingentConsiderationLiability
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual                 40,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual        
Business Acquisition, Pro Forma Net Income (Loss)                 (7,600,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss        
NeoStem, Inc. common stockholders $ (0.32)us-gaap_EarningsPerShareBasicAndDiluted $ (0.48)us-gaap_EarningsPerShareBasicAndDiluted $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted $ (0.49)us-gaap_EarningsPerShareBasicAndDiluted $ (0.47)us-gaap_EarningsPerShareBasicAndDiluted $ (0.45)us-gaap_EarningsPerShareBasicAndDiluted $ (0.46)us-gaap_EarningsPerShareBasicAndDiluted $ (0.53)us-gaap_EarningsPerShareBasicAndDiluted   $ (1.68)us-gaap_EarningsPerShareBasicAndDiluted $ (1.90)us-gaap_EarningsPerShareBasicAndDiluted $ (4.00)us-gaap_EarningsPerShareBasicAndDiluted  
Business Combination, Acquired Receivables, Fair Value                         45,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets                         19,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                         34,290,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable                         333,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities                         2,014,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                         $ 33,491,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet