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Revenues, Recognition and Allowances (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue from Contract with Customer [Abstract]        
Gross Company product sales $ 48,142 $ 66,744 $ 84,690 $ 121,044
Deduction to gross product sales:        
Chargebacks and billbacks 21,449 44,090 38,364 74,105
Wholesaler fees for service 477 0 1,112 0
Sales discounts and other allowances 11,037 6,766 16,799 14,615
Total reduction to gross product sales 32,963 50,856 56,275 88,720
Company product sales, net $ 15,179 $ 15,888 $ 28,415 $ 32,324