Business Acquisition Cost Of Acquired Entity Upfront Payment

No definition available.

Name:	amag_BusinessAcquisitionCostOfAcquiredEntityUpfrontPayment
Namespace Prefix:	amag_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Payments due if the option to acquire the global rights to the Digoxin Immune Fab program is exercised, including the payment of the option exercise price and the regulatory milestone payments.

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No definition available.

+ Details

Name:	amag_PaymentForExerciseOfOptionToAcquireGlobalRightsToDigoxinImmuneFabProgram
Namespace Prefix:	amag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the payments due for sales milestones based upon the achievement of annual sales milestones.

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No definition available.

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Namespace Prefix:	amag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the annual sales milestone targets that will require additional payments.

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No definition available.

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Name:	amag_SalesMilestoneTargets
Namespace Prefix:	amag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Upfront payment made for the option to acquire the global rights to the DIF program.

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No definition available.

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Name:	amag_UpfrontPaymentIssuedForOptionAgreement
Namespace Prefix:	amag_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

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.

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No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Period Type:	duration

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
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Collaboration, License and Other Strategic Agreements (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Sep. 30, 2015	Dec. 31, 2016
Velo
Collaborative Agreements
Upfront payment		$ 10,000,000
Payments due			$ 65,000,000
Velo \| Minimum
Collaborative Agreements
Sales milestone targets			100,000,000
Velo \| Maximum
Collaborative Agreements
Sales milestone payments based on annual sales milestones			250,000,000
Sales milestone targets			$ 900,000,000
MuGard
Collaborative Agreements
Cost of acquired entity upfront payment	$ 3,300,000