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Basis of Presentation and Accounting Policies (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Feb. 18, 2014
Basis of presentation    
Elimination of noncontrolling interest of ContraVir upon distribution $ 1,622sgyp_NoncontrollingInterestElimination  
Spin-off | ContraVir Subsidiary    
Basis of presentation    
Net assets   1,740sgyp_SpinoffNetAsset
/ dei_LegalEntityAxis
= sgyp_ContraVirPharmaceuticalsIncMember
/ us-gaap_NonmonetaryTransactionTypeAxis
= us-gaap_SpinoffMember
ContraVir Subsidiary    
Basis of presentation    
ContraVir shares distributed for each Synergy common stock share held   0.0986sgyp_DividendDistributedNumberOfSharesOfSubsidiaryDistributedForEachShareOfCommonStockHeldByStockholdersOfEntity
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sgyp_ContraVirPharmaceuticalsIncMember
ContraVir Subsidiary | Spin-off    
Basis of presentation    
Elimination of noncontrolling interest of ContraVir upon distribution   1,600sgyp_NoncontrollingInterestElimination
/ us-gaap_NonmonetaryTransactionTypeAxis
= us-gaap_SpinoffMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= sgyp_ContraVirPharmaceuticalsIncMember