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Acquisitions CSC acquisitions (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]                          
Revenues $ 5,276us-gaap_Revenues $ 4,118us-gaap_Revenues $ 4,489us-gaap_Revenues $ 4,056us-gaap_Revenues $ 4,078us-gaap_Revenues $ 3,707us-gaap_Revenues $ 4,359us-gaap_Revenues $ 2,524us-gaap_Revenues   $ 17,938,790us-gaap_Revenues $ 14,668,455us-gaap_Revenues $ 14,329,889us-gaap_Revenues  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual                 40,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual        
Common Stock, Shares, Issued                         5,329,593us-gaap_CommonStockSharesIssued
Business Acquisition, Transaction Costs                         33,500,000us-gaap_BusinessAcquisitionCostOfAcquiredEntityTransactionCosts
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents                         51,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
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, 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
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
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 and Liabilities Assumed, Deferred Tax Liabilities Noncurrent                         13,901,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net                         33,491,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
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
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 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  
Net loss                   (55,466,246)us-gaap_ProfitLoss (39,485,334)us-gaap_ProfitLoss (66,369,311)us-gaap_ProfitLoss  
Net Income (Loss) Attributable to Parent (11,612)us-gaap_NetIncomeLoss (16,974)us-gaap_NetIncomeLoss (12,605)us-gaap_NetIncomeLoss (13,682)us-gaap_NetIncomeLoss (12,535)us-gaap_NetIncomeLoss (9,071)us-gaap_NetIncomeLoss (8,575)us-gaap_NetIncomeLoss (8,801)us-gaap_NetIncomeLoss   (54,872,933)us-gaap_NetIncomeLoss (38,981,244)us-gaap_NetIncomeLoss (53,769,484)us-gaap_NetIncomeLoss  
NeoStem, Inc. [Member]                          
Business Acquisition [Line Items]                          
Revenues                   17,939,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
14,668,000us-gaap_Revenues
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
   
NeoStem, Inc. common stockholders                   $ (1.68)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
$ (1.90)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
   
Net loss                   (55,467,000)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
(39,485,000)us-gaap_ProfitLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
   
Net Income (Loss) Attributable to Parent                   (54,873,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
(38,981,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeostemIncMember
   
NeoStem Oncology [Member]                          
Business Acquisition [Line Items]                          
Business Acquisition, Pro Forma Revenue                   18,649,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
15,471,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
   
Business Acquisition, Pro Forma Net Income (Loss)                   (57,964,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
(44,790,000)us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
   
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual                   $ (57,371,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
$ (44,286,000)us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
   
Business Acquisition, Pro Forma Earnings Per Share, Diluted                   $ (1.51)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember
$ (1.71)us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_StatementBusinessSegmentsAxis
= nbs_NeoStemOncologyMember