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Inventory (Tables)
9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventory Inventory consisted of the following at September 30, 2019 and December 31, 2018 (in thousands):
 
September 30, 2019
 
December 31, 2018
Raw materials
$
21,096

 
$
19,670

Finished goods
19,570

 
14,093

Total inventory
$
40,666

 
$
33,763