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Revenue Recognition (Tables)
 12 Months Ended
Dec. 31, 2018
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 year ended December 31, 2018 (in thousands):

 

 

 

Chargebacks, discounts and other fees

 

 

Returns

 

 

Total

 

Balance at December 31, 2017

 

$

-

 

 

$

-

 

 

$

-

 

Provision related to current period sales

 

 

4,012

 

 

 

570

 

 

 

4,582

 

Credit or payments made during the period

 

 

(2,276

)

 

 

(1

)

 

 

(2,277

)

Balance at December 31, 2018

 

$

1,736

 

 

$

569

 

 

$

2,305