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License and Collaboration Agreements - Schedule of Revenue Recognized and Assets and Liabilities under Collaborative Arrangements (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total $ 14,842,000us-gaap_Revenues $ 13,034,000us-gaap_Revenues  
Sanofi [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Total 0us-gaap_Revenues
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
   
License and Collaboration Agreements [Member] | Baxter [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Accounts receivable, billed 1,615,000us-gaap_BilledContractReceivables
/ us-gaap_CounterpartyNameAxis
= mack_BaxterMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
   
Accounts receivable, unbilled 2,600,000us-gaap_UnbilledContractsReceivable
/ us-gaap_CounterpartyNameAxis
= mack_BaxterMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
  1,615,000us-gaap_UnbilledContractsReceivable
/ us-gaap_CounterpartyNameAxis
= mack_BaxterMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
Deferred revenue 78,914,000us-gaap_DeferredRevenue
/ us-gaap_CounterpartyNameAxis
= mack_BaxterMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
  91,156,000us-gaap_DeferredRevenue
/ us-gaap_CounterpartyNameAxis
= mack_BaxterMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
License and Collaboration Agreements [Member] | Sanofi [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Accounts receivable, billed     369,000us-gaap_BilledContractReceivables
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
Accounts receivable, unbilled     1,282,000us-gaap_UnbilledContractsReceivable
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
Upfront payment   1,250,000mack_CollaborativeArrangementRevenueRecognizedUpfrontPayment
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
 
Milestone payments   521,000mack_MilestonePaymentsRecognizedInRevenueDuringPeriod
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
 
Development services   10,700,000mack_CollaborativeArrangementRevenueRecognizedDevelopmentServices
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
 
Manufacturing services and other   563,000mack_CollaborativeArrangementRevenueRecognizedManufacturingServicesAndOther
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember
 
Total   $ 13,034,000us-gaap_Revenues
/ us-gaap_CounterpartyNameAxis
= mack_SanofiMember
/ us-gaap_TypeOfArrangementAxis
= us-gaap_CollaborativeArrangementMember