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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Summary of Allowance Activity Included in Trade Receivables Includes Allowance for Doubtful Accounts, Prompt Pay Cash Discounts and Chargebacks
The following table summarizes activity in each of the product revenue allowance and reserve categories for the year ended December 31, 2019:
 
Chargebacks
 
Government Rebates
 
Total
 
(in thousands)
Balance at December 31, 2016:
$
468

 
$
3,427

 
$
3,895

Provision recorded during the period
2,637

 
18,097

 
20,734

Credit or payments made during the period
(2,178
)
 
(13,563
)
 
(15,741
)
Balance at December 31, 2017:
927

 
7,961

 
8,888

Provision related to current period sales
2,687

 
28,628

 
31,315

Provision related to prior period sales
—

 
532

 
532

Credit or payments made during the period
(3,268
)
 
(25,988
)
 
(29,256
)
Balance at December 31, 2018:
346

 
11,133

 
11,479

Provision related to current period sales
783

 
24,374

 
25,157

Provision related to prior period sales
—

 
(95
)
 
(95
)
Credit or payments made during the period
(852
)
 
(27,203
)
 
(28,055
)
Balance at December 31, 2019:
$
277

 
$
8,209

 
$
8,486