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Document And Entity Information
 12 Months Ended
Dec. 31, 2014
Document Information [Line Items]  
Entity Registrant Name BIO BLAST PHARMA LTD.
Entity Central Index Key 0001596812
Current Fiscal Year End Date --12-31
Entity Filer Category Non-accelerated Filer
Trading Symbol ORPN
Entity Common Stock, Shares Outstanding 14,230,480dei_EntityCommonStockSharesOutstanding
Document Type 20-F
Amendment Flag false
Document Period End Date Dec. 31, 2014
Document Fiscal Period Focus FY
Document Fiscal Year Focus 2014
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes