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2. Significant Customers (Tables)
3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Significant Customers

The following tables list the Company's customers that individually comprised greater than 10% of total gross product sales for the three months ended March 31, 2018 and 2017, or 10% of total accounts receivable as of March 31, 2018 and December 31, 2017.

Gross Product Sales:            
      Three Months Ended
      March 31,
      2018     2017
             
McKesson Corporation     34%     34%
AmerisourceBergen Drug Corporation     26%     28%
Cardinal Health, Inc.     26%     28%
     Total     86%     90%

 

Accounts Receivable, net:            
      March 31,     December 31,
      2018     2017
             
Cardinal Health, Inc.     34%     31%
McKesson Corporation     31%     29%
AmerisourceBergen Drug Corporation     24%     27%
     Total     89%     87%