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Other Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Other Accrued Liabilities    
Compensation and benefits $ 3,852us-gaap_EmployeeRelatedLiabilitiesCurrent $ 3,137us-gaap_EmployeeRelatedLiabilitiesCurrent
Professional fees 1,285us-gaap_AccruedProfessionalFeesCurrent 1,585us-gaap_AccruedProfessionalFeesCurrent
Other 1,040us-gaap_OtherAccruedLiabilitiesCurrent 996us-gaap_OtherAccruedLiabilitiesCurrent
Other accrued liabilities $ 6,177snta_AccruedLiabilitiesCurrentExcludingAccruedContractResearchCosts $ 5,718snta_AccruedLiabilitiesCurrentExcludingAccruedContractResearchCosts