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Product Revenue Reserves and Allowances (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 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
9,750

 
15,350

 
229

 
25,329

Adjustments related to prior period sales
(76
)
 
(106
)
 
(111
)
 
(293
)
Credits and payments made
(8,971
)
 
(9,257
)
 
(236
)
 
(18,464
)
Ending balance at September 30, 2018
$
2,689

 
$
7,218

 
$
303

 
$
10,210

 
 
 
 
 
 
 
 
Ending balance at December 31, 2018
$
3,198

 
$
7,620

 
$
411

 
$
11,229

Provision related to sales in the current year
21,203

 
44,426

 
698

 
66,327

Adjustments related to prior period sales
(27
)
 
697

 
—

 
670

Credits and payments made
(19,759
)
 
(34,190
)
 
(575
)
 
(54,524
)
Ending balance at September 30, 2019
$
4,615

 
$
18,553

 
$
534

 
$
23,702