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Product Revenue Reserves and Allowance Product Revenue Reserves and Allowance (Tables)
 12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of product revenue allowance and reserve categories
The following table summarizes activity in each of the product revenue allowance and reserve categories for the twelve months ended December 31, 2018 and 2017 (in thousands):
 
Chargebacks, Discounts, and Fees
 
Government and Other Rebates
 
Returns
 
Total
Beginning balance at December 31, 2016
$
—

 
$
—

 
$
—

 
$
—

Provision related to sales in the current year, net of credits and payments
$
1,986

 
$
1,231

 
$
421

 
$
3,638

Ending balance at December 31, 2017
$
1,986

 
$
1,231

 
$
421

 
$
3,638

Provision related to sales in the current year
15,281

 
24,156

 
355

 
39,792

Adjustment related to prior periods sales
(140
)
 
254

 
(111
)
 
3

Credits and payments made
(13,929
)
 
(18,021
)
 
(254
)
 
(32,204
)
Ending balance at December 31, 2018
$
3,198

 
$
7,620

 
$
411

 
$
11,229