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Concentrations of Credit Risk (Tables)
 3 Months Ended
Mar. 31, 2017
Risks and Uncertainties [Abstract]  
Schedules of Concentration Risk
The following table sets forth the percentage of total revenues recognized by customer that represent 10% or more of total revenues:
 
Three Months Ended March 31,
 
2017
 
2016
Diplomat Specialty Pharmacy
25
%
 
55
%
Caremark L.L.C.
17
%
 
—
%
Affiliates of McKesson Corporation
14
%
 
—
%
Accredo Health, Incorporated
12
%
 
—
%
Merck
—
%
 
32
%
The following table shows the revenues earned by geographic region. Net product revenues are attributed to regions based on the delivery location. Collaboration revenues are attributed to regions based on where the collaboration partner is headquartered (dollars in thousands):
 
Three Months Ended March 31,
 
2017
 
2016
U.S.
$
73,675

 
$
13,594

Europe
4,530

 
1,833

Japan
2,682

 
—