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Product Revenue Reserves and Allowance (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018 (in thousands):
 
Chargebacks, Discounts, and Fees
 
Government and Other Rebates
 
Returns
 
Total
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

Provision related to sales in the current year
30,960

 
62,271

 
1,673

 
94,904

Adjustment related to prior periods sales
(81
)
 
337

 
(10
)
 
246

Credits and payments made
(28,338
)
 
(52,948
)
 
(491
)
 
(81,777
)
Ending balance at December 31, 2019
$
5,739

 
$
17,280

 
$
1,583

 
$
24,602