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Loss per Share (Tables)
 3 Months Ended
Mar. 31, 2014
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of basic and diluted loss per share for the three months ended March 31, 2014 and 2013:

 
Three Months Ended March 31,
 
 
2014
 
2013
 
 
(in thousands, except per share amounts)
Basic and diluted
 
 
 
 
Net loss attributable to The Medicines Company
$
(4,996
)
 
$
(11,573
)
 
 
 
 
 
 
Weighted average common shares outstanding, basic
64,152

 
54,047

 
Plus: net effect of dilutive stock options, restricted common shares and shares issuable upon conversion of Notes
—

 
—

 
Weighted average common shares outstanding, diluted
64,152

 
54,047

 
 
 
 
 
 
Loss per share attributable to The Medicines Company, basic
$
(0.08
)
 
$
(0.21
)
 
Loss per share attributable to The Medicines Company, diluted
$
(0.08
)
 
$
(0.21
)