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Borrowings - Schedule of Future Minimum Payments under the Loans Payable (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Less current portion   $ 13,346us-gaap_LongTermDebtCurrent
Loans payable, net of current portion 122,080us-gaap_LongTermDebtNoncurrent 106,806us-gaap_LongTermDebtNoncurrent
4.50% Convertible Senior Notes [Member]    
Debt Instrument [Line Items]    
Remainder of 2015 2,813us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
2016 5,625us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
2017 5,625us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
2018 5,625us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
2019 and thereafter 136,250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Loans payable, gross 155,938us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Less interest (30,938)mack_ContractualInterestIncludedInPayments
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Less unamortized discount (42,401)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Less current portion 0us-gaap_LongTermDebtCurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Loans payable, net of current portion 82,599us-gaap_LongTermDebtNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
 
Loans Payable [Member] | Loan and Security Agreement [Member]    
Debt Instrument [Line Items]    
Remainder of 2015 3,224us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
2016 13,575us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
2017 18,167us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
2018 16,639us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Loans payable, gross 51,605us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Less interest (10,405)mack_ContractualInterestIncludedInPayments
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Less unamortized discount (1,719)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Less current portion 0us-gaap_LongTermDebtCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember
 
Loans payable, net of current portion $ 39,481us-gaap_LongTermDebtNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_LoansPayableMember