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2. Significant Customers (Tables)
6 Months Ended
Jun. 30, 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 and six months ended June 30, 2018 and 2017, or 10% of total accounts receivable as of June 30, 2018 and December 31, 2017.

Gross Product Sales:

      Three Months Ended     Six Months Ended
      June 30,     June 30,
      2018     2017     2018     2017
                         
McKesson Corporation     32%     34%     33%     34%
AmerisourceBergen Drug Corporation     27%     33%     27%     31%
Cardinal Health, Inc.     21%     23%     24%     25%
     Total     80%     90%     84%     90%

 

Accounts Receivable, net:            
      June 30,     December 31,
      2018     2017
             
Cardinal Health, Inc.     38%     31%
McKesson Corporation     30%     29%
AmerisourceBergen Drug Corporation     23%     27%
     Total     91%     87%