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Revenue Reserves (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue From Contract With Customer [Abstract]  
Summary of Receivable Related Allowances and Revenue Related Liabilities

The following table summarizes activity in each of our receivable-related allowances and revenue-related liabilities for the year ended December 31, 2018:

 

(in thousands)

 

Chargebacks and

Rebates

 

 

Distribution

Fees, Cash

Discounts

and Patient

Assistance

 

Balance at December 31, 2017

 

$

(428

)

 

$

(240

)

Provision related to current period sales

 

 

(2,515

)

 

 

(1,879

)

Credit or payments made during the period

 

 

1,620

 

 

 

1,254

 

Balance at December 31, 2018

 

$

(1,323

)

 

$

(865

)