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License Agreements - Additional Information (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Indiana University Research and Technology Corporation [Member]  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Potential milestone payment $ 825,000asmb_PotentialMilestonePayments
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= asmb_IndianaUniversityResearchAndTechnologyCorporationMember
Indiana University Research and Technology Corporation [Member] | Maximum [Member]  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Diligence maintenance fees Obligation 100,000asmb_DiligenceMaintenanceFeesObligation
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= asmb_IndianaUniversityResearchAndTechnologyCorporationMember
Indiana University Research and Technology Corporation [Member] | Minimum [Member]  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Diligence maintenance fees Obligation 25,000asmb_DiligenceMaintenanceFeesObligation
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersByTypeAxis
= asmb_IndianaUniversityResearchAndTechnologyCorporationMember
S.L.A. Pharma [Member]  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Potential milestone payment 20,000,000asmb_PotentialMilestonePayments
/ asmb_BusinessAcquisitionAgreementCounterPartyAxis
= asmb_CompanyBMember
Therabiome, LLC [Member]  
Research and Development Arrangement, Contract to Perform for Others [Line Items]  
Payment For Nonrefundable License Fee $ 300,000asmb_PaymentForNonrefundableLicenseFee
/ dei_LegalEntityAxis
= asmb_TherabiomeLlcMember