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Inventory (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventory Inventory consisted of the following at June 30, 2019 and December 31, 2018 (in thousands):
 
June 30, 2019
 
December 31, 2018
Raw materials
$
21,784

 
$
19,670

Finished goods
19,215

 
14,093

Total inventory
$
40,999

 
$
33,763