CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 12,904	$ (7,102)
Adjustments to reconcile net income ( loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	14,519	162
Amortization of premium/discount on purchased securities	56	664
Write-down of inventory to net realizable value		1,437us-gaap_InventoryWriteDown
Non-cash equity-based compensation expense	2,668us-gaap_ShareBasedCompensation	1,930us-gaap_ShareBasedCompensation
Amortization of debt discount and debt issuance costs	2,401	851
Other income		(100)us-gaap_OtherIncome
Change in fair value of contingent consideration	2,599	789
Deferred tax liabilities	5,608us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:
Accounts receivable, net	(18,004)	(3,273)
Inventories	3,326us-gaap_IncreaseDecreaseInInventories	(2,521)us-gaap_IncreaseDecreaseInInventories
Receivable from collaboration	4,518	76
Prepaid and other current assets	3,076	(1,014)
Other long-term assets	2,106	885
Accounts payable and accrued expenses	4,852	(1,101)
Deferred revenues	(10,813)	(3,075)
Other long-term liabilities	(420)	318
Total adjustments	16,492	(3,972)
Net cash provided by (used in) operating activities	29,396	(11,074)
Cash flows from investing activities:
Proceeds from sales or maturities of investments	1,459	26,706
Purchase of investments	(93,895)	(25,046)
Proceeds from sale of assets		100
Capital expenditures	(55)	(124)
Change in restricted cash		2,883
Net cash (used in) provided by investing activities	(92,491)	4,519
Cash flows from financing activities:
Proceeds from the issuance of common stock, net of underwriting discounts and other expenses	189,150
Long-term debt principal payment	(8,185)us-gaap_RepaymentsOfLongTermDebt
Proceeds from issuance of convertible 2.5% senior notes		200,000us-gaap_ProceedsFromConvertibleDebt
Payment of debt issuance costs		(6,361)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from issuance of warrants		25,620us-gaap_ProceedsFromIssuanceOfWarrants
Purchase of convertible bond hedges		(39,760)
Payment of contingent consideration	(84)amag_PaymentOfContingentConsideration	(31)amag_PaymentOfContingentConsideration
Proceeds from the exercise of stock options	6,719	1,017
Net cash provided by financing activities	187,600	180,485
Net increase in cash and cash equivalents	124,505	173,930
Cash and cash equivalents at beginning of the year	119,296	26,986
Cash and cash equivalents at end of the year	243,801	200,916
Supplemental data of cash flow information:
Interest paid on long-term debt	6,380us-gaap_InterestPaid
Interest paid on convertible 2.5% senior notes	$ 2,500amag_InterestPaidOnConvetibleNotes

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The increase (decrease) during the reporting period in other noncurrent operating assets not separately disclosed in the statement of cash flows.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) in cash associated with the entity's continuing operating, investing, and financing activities. While for technical reasons this element has no balance attribute, the default assumption is a debit balance consistent with its label.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

+ Details

Name:	us-gaap_ProceedsFromSaleOfProductiveAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
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Balance Type:	debit
Period Type:	duration

- Details

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