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Segment and Significant Customer Information (Tables)
6 Months Ended
Jun. 30, 2015
Segment and Significant Customer Information [Abstract]  
Schedule of sales to significant customers

  Three-Month Periods 
Ended June 30,
  Six-Month Periods 
Ended June 30,
 
  2015  2014  2015  2014 
Animal Health International, Inc.(1)  42%  41%  42%  39%
MWI Veterinary Supply Company(2)  13%  20%  21%  22%
Robert J. Matthews Company  11%  *   *   * 
Schedule of accounts receivable due from significant customers

  As of 
June 30,
2015
  As of
December 31, 2014
 
Animal Health International, Inc.(1)  25%  45%
MWI Veterinary Supply Company(2)  19%  26%
ANIMART, LLC  16%  * 
Robert J. Matthews Company  15%  *