Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net revenue	$ 724,408us-gaap_SalesRevenueNet	$ 687,864us-gaap_SalesRevenueNet	$ 558,588us-gaap_SalesRevenueNet
Operating expenses:
Cost of revenue	287,630us-gaap_CostOfGoodsAndServicesSold	262,785us-gaap_CostOfGoodsAndServicesSold	177,339us-gaap_CostOfGoodsAndServicesSold
Research and development	159,181us-gaap_ResearchAndDevelopmentExpense	146,930us-gaap_ResearchAndDevelopmentExpense	126,423us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	342,164	264,958	171,753
Total operating expenses	788,975us-gaap_CostsAndExpenses	674,673us-gaap_CostsAndExpenses	475,515us-gaap_CostsAndExpenses
(Loss) income from operations	(64,567)us-gaap_OperatingIncomeLoss	13,191us-gaap_OperatingIncomeLoss	83,073us-gaap_OperatingIncomeLoss
Settlement	25,736	0	0
Co-promotion and profit share income	24,236mdco_CoPomotionIncome	17,383mdco_CoPomotionIncome	10,000mdco_CoPomotionIncome
Loss in equity investment	(1,711)	0	0
Interest expense	(15,701)us-gaap_InterestExpense	(15,531)us-gaap_InterestExpense	(8,005)us-gaap_InterestExpense
Investment impairment	(7,500)	0	0
Other income	322us-gaap_OtherNonoperatingIncomeExpense	1,577us-gaap_OtherNonoperatingIncomeExpense	1,140us-gaap_OtherNonoperatingIncomeExpense
(Loss) income before income taxes	(39,185)	16,620	86,208
Benefit (provision) for income taxes	6,837us-gaap_IncomeTaxExpenseBenefit	(1,360)us-gaap_IncomeTaxExpenseBenefit	(35,038)us-gaap_IncomeTaxExpenseBenefit
(Loss) net income	(32,348)us-gaap_NetIncomeLoss	15,260us-gaap_NetIncomeLoss	51,170us-gaap_NetIncomeLoss
Net loss attributable to non-controlling interest	138	252	84
Net (loss) income attributable to The Medicines Company	$ (32,210)us-gaap_ProfitLoss	$ 15,512us-gaap_ProfitLoss	$ 51,254us-gaap_ProfitLoss
Earnings per common share attributable to The Medicines Company:
Basic (USD per share)	$ (0.50)us-gaap_EarningsPerShareBasic	$ 0.27us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic
Diluted (USD per share)	$ (0.50)us-gaap_EarningsPerShareDiluted	$ 0.25us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding:
Basic (shares)	64,473	58,096	53,545
Diluted (shares)	64,473	62,652	55,346

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