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Acquisition (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
May 08, 2014
Business Acquisition [Line Items]        
Change in acquisition-related contingent consideration $ 550,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 $ 190,000us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1    
Revenues 3,172,279us-gaap_Revenues 4,055,575us-gaap_Revenues    
Net loss (19,231,488)us-gaap_ProfitLoss (13,830,084)us-gaap_ProfitLoss    
Common Stock, Shares, Issued 39,423,911us-gaap_CommonStockSharesIssued   36,783,857us-gaap_CommonStockSharesIssued 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
Acquisition-related contingent consideration 18,810,000us-gaap_BusinessCombinationContingentConsiderationLiability   18,260,000us-gaap_BusinessCombinationContingentConsiderationLiability 11,900,000us-gaap_BusinessCombinationContingentConsiderationLiability
Business Acquisition, Transaction Costs       33,500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Cash and cash equivalents       51,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
Accounts receivable, net of allowance for doubtful accounts of $390,118 and $391,829 at March 31, 2014 and December 31, 2013, respectively       45,000us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Prepaid expenses and other current assets       19,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
Property, plant and equipment, net       1,041,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
Other assets       201,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
Goodwill 25,209,336us-gaap_Goodwill   25,209,336us-gaap_Goodwill 14,092,000us-gaap_Goodwill
Equity Issued in Business Combination, Fair Value Disclosure       21,600,000us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure
Intangible assets, net       34,290,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
Accounts Payable, Current       (333,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable
Accrued Liabilities, Current       (2,014,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent       (13,901,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
Deferred Tax Liabilities, Net, Noncurrent (46,633)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes (47,409)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes    
Basic and diluted loss per share attributable to NeoStem, Inc. common stockholders $ (0.51)us-gaap_EarningsPerShareBasicAndDiluted $ (0.49)us-gaap_EarningsPerShareBasicAndDiluted    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net       33,491,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
NeoStem Oncology [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Revenue   4,272,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember		    
Business Acquisition, Pro Forma Net Income (Loss)   (15,523,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember		    
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual   (15,375,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember		    
Business Acquisition, Pro Forma Earnings Per Share, Diluted   $ (0.46)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember		    
NeoStem, Inc. [Member]        
Business Acquisition [Line Items]        
Revenues   4,056,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember		    
Net loss   (13,830,000)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember		    
Net Income (Loss) Attributable to Parent   $ (13,682,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember		    
Basic and diluted loss per share attributable to NeoStem, Inc. common stockholders   $ (0.49)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember