Name:	mack_CollaborativeArrangementRevenueRecognizedDevelopmentServices
Namespace Prefix:	mack_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the amount of revenue recognized from manufacturing services and other fees received during the period under the terms of license and collaboration agreements.

No definition available.

Name:	mack_CollaborativeArrangementRevenueRecognizedManufacturingServicesAndOther
Namespace Prefix:	mack_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Represents the amount of revenue recognized from upfront payment received during the period under the terms of license and collaboration agreements.

No definition available.

Name:	mack_CollaborativeArrangementRevenueRecognizedUpfrontPayment
Namespace Prefix:	mack_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Represents the amount of revenue recognized from milestone payments during the period under the terms of license and collaboration agreements.

No definition available.

Name:	mack_MilestonePaymentsRecognizedInRevenueDuringPeriod
Namespace Prefix:	mack_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d),(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688