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Inventory
 3 Months Ended
Mar. 31, 2018
Inventory  
Inventory

6. Inventory

 

Inventory consisted of the following:

 

 

 

 

 

 

 

 

 

 

As of March 31, 

 

As of December 31, 

 

 

2018

 

2017

Raw materials

 

$

532

 

$

616

Work in process

 

 

496

 

 

322

Finished goods

 

 

6,874

 

 

875

Total inventory

 

$

7,902

 

$

1,813

 

The aggregate charges related to excess inventory for both the March 31, 2018 and 2017 were immaterial. These expenses were recorded as a component of cost of product revenues.