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Inventory
6 Months Ended
Jun. 30, 2019
Inventory  
Inventory

7. Inventory

Inventory consisted of the following:

As of June 30, 

As of December 31, 

2019

2018

Raw materials

$

1,664

$

496

Work in process

848

671

Finished goods

7,441

6,650

Total inventory

$

9,953

$

7,817

The aggregate charges related to excess inventory for the three and six months ended June 30, 2019 and 2018 were immaterial. These expenses were recorded as a component of cost of product revenues.