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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue Recognition [Abstract]  
Summary of Product Revenue Allowance and Reserve Categories The following table summarizes balances and activity in each of the product revenue allowance and reserve categories for the three months ended March 31, 2019 (in thousands):

 

 

Chargebacks, distribution fees, discounts and other fees

 

 

Returns

 

 

Total

 

Balance at December 31, 2018

 

$

1,736

 

 

$

569

 

 

$

2,305

 

Provision related to current period sales

 

 

3,080

 

 

 

458

 

 

 

3,538

 

Credit or payments made during the period

 

 

(1,658

)

 

 

(86

)

 

 

(1,744

)

Balance at March 31, 2019

 

$

3,158

 

 

$

941

 

 

$

4,099