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Co-Development and License Agreements (Details) (License Arrangement)
May 31, 2014
item
License Arrangement
  
Co-Development and License Agreements  
Number of lead candidates 2snta_NumberOfLeadCandidates
/ us-gaap_TypeOfArrangementAxis
= snta_LicenseArrangementMember
Number of lead candidates to be developed 1snta_NumberOfLeadCandidatesToBeDeveloped
/ us-gaap_TypeOfArrangementAxis
= snta_LicenseArrangementMember