Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
U.S. product sales, net	$ 108,795us-gaap_SalesRevenueGoodsNet	$ 71,362us-gaap_SalesRevenueGoodsNet	$ 58,287us-gaap_SalesRevenueGoodsNet
License fee and other collaboration revenues	10,886	8,385	26,475
Other product sales and royalties	4,703amag_SalesRevenueGoodsAndRoyaltiesOther	1,109amag_SalesRevenueGoodsAndRoyaltiesOther	616amag_SalesRevenueGoodsAndRoyaltiesOther
Total revenues	124,384us-gaap_SalesRevenueNet	80,856us-gaap_SalesRevenueNet	85,378us-gaap_SalesRevenueNet
Costs and expenses:
Cost of product sales	20,306us-gaap_CostOfGoodsSold	11,960us-gaap_CostOfGoodsSold	14,220us-gaap_CostOfGoodsSold
Research and development expenses	24,160	20,564	33,296
Selling, general and administrative expenses	72,254	59,167	53,071
Acquisition-related costs	9,478	782
Restructuring expenses	2,023us-gaap_RestructuringCharges		2,215us-gaap_RestructuringCharges
Total costs and expenses	128,221us-gaap_CostsAndExpenses	92,473us-gaap_CostsAndExpenses	102,802us-gaap_CostsAndExpenses
Operating loss	(3,837)us-gaap_OperatingIncomeLoss	(11,617)us-gaap_OperatingIncomeLoss	(17,424)us-gaap_OperatingIncomeLoss
Other income (expense):
Interest expense	(14,697)us-gaap_InterestExpense
Interest and dividend income, net	975us-gaap_InvestmentIncomeNet	1,051us-gaap_InvestmentIncomeNet	1,286us-gaap_InvestmentIncomeNet
Gains on sale of assets	103us-gaap_GainLossOnDispositionOfAssets1	924us-gaap_GainLossOnDispositionOfAssets1
Gains (losses) on investments, net	114us-gaap_MarketableSecuritiesGainLoss	40us-gaap_MarketableSecuritiesGainLoss	(1,466)us-gaap_MarketableSecuritiesGainLoss
Total other income (expense)	(13,505)us-gaap_NonoperatingIncomeExpense	2,015us-gaap_NonoperatingIncomeExpense	(180)us-gaap_NonoperatingIncomeExpense
Net income (loss) before income taxes	(17,342)	(9,602)	(17,604)
Income tax benefit	153,159us-gaap_CurrentIncomeTaxExpenseBenefit		854us-gaap_CurrentIncomeTaxExpenseBenefit
Net income (loss)	$ 135,817	$ (9,602)	$ (16,750)
Net Income (Loss) per share:
Basic (in dollars per share)	$ 6.06us-gaap_EarningsPerShareBasic	$ (0.44)us-gaap_EarningsPerShareBasic	$ (0.78)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 5.45us-gaap_EarningsPerShareDiluted	$ (0.44)us-gaap_EarningsPerShareDiluted	$ (0.78)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding used to compute net income (loss) per share:
Basic (in shares)	22,416	21,703	21,392
Diluted (in shares)	25,225	21,703	21,392

Revenue earned during the period relating to 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. Consideration received may include upfront and milestone payments and certain reimbursement payments.

No definition available.