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Product Revenue Reserves and Allowances (Tables)
 9 Months Ended
Sep. 30, 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 nine months ended September 30, 2018 and 2017 (in thousands):
 
Chargebacks, Discounts, and Fees
 
Government and other rebates
 
Returns
 
Total
Beginning 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

 
 
 
 
 
 
 
 
Beginning balance at December 31, 2016
$
—

 
$
—

 
$
—

 
$
—

Provision related to sales in the current year
688

 
459

 
296

 
1,443

Adjustments related to prior period sales


 


 


 
—

Credits and payments made


 


 


 
—

Ending balance at September 30, 2017
$
688

 
$
459

 
$
296

 
$
1,443