Document and Entity Information Document (USD $)	3 Months Ended
	Mar. 31, 2014	May 08, 2014	Jun. 30, 2013
Document Information [Line Items]
Entity Registrant Name	NeoStem, Inc.
Entity Central Index Key	0000320017
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		34,008,862
Entity Public Float			$ 92,300,000