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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Schedule of customers representing greater than 10% of revenue balances The following table sets forth customers who represented 10% or more of our total revenues for the three and nine months ended September 30, 2019 and 2018:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
McKesson Corporation
38
%
 
25
%
 
37
%
 
26
%
AmerisourceBergen Drug Corporation
28
%
 
24
%
 
28
%
 
26
%
Cardinal Health
11
%
 
<10%

 
12
%
 
<10%