Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 607,073	$ 370,741
Accounts receivable, net of allowances of $49.0 million and $47.0 million at March 31, 2015 and December 31, 2014, respectively	99,436	155,691
Inventory	127,425	81,450
Deferred tax assets	33,080	33,080
Prepaid expenses and other current assets	14,729	16,012
Total current assets	881,743	656,974
Fixed assets, net	38,801	40,060
Intangible assets, net	1,041,804	892,659
Goodwill	314,070	286,532
Restricted cash	1,444	1,446
Other assets	14,112	8,034
Total assets	2,291,974	1,885,705
Current liabilities:
Accounts payable	13,633	19,799
Accrued expenses	111,896	159,252
Current portion of contingent purchase price	215,346	210,422
Deferred revenue	10,570	14,350
Total current liabilities	351,445	403,823
Contingent purchase price	154,206	140,712
Deferred tax liabilities	215,133	164,459
Convertible senior notes (due 2017 and 2022)	562,725	246,676
Other liabilities	7,088	9,944
Total liabilities	1,290,597	965,614
Stockholders' equity:
Preferred stock, $1.00 par value per share, 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value per share,125,000,000 shares authorized; 68,394,935 issued and 66,201,953 outstanding at March 31, 2015 and 67,667,468 issued and 65,474,486 outstanding at December 31, 2014, respectively	68	68
Additional paid-in capital	1,118,654	1,045,078
Treasury stock, at cost; 2,192,982 shares at March 31, 2015 and December 31, 2014, respectively	(50,000)	(50,000)
Accumulated deficit	(72,077)	(77,109)
Accumulated other comprehensive loss	5,234	2,528
Total The Medicines Company stockholders' equity	1,001,879	920,565
Non-controlling interest in joint venture	(502)	(474)
Total stockholders' equity	1,001,377	920,091
Total liabilities and stockholders' equity	$ 2,291,974	$ 1,885,705