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Inventory
3 Months Ended
Mar. 31, 2021
Inventory  
Inventory

7. Inventory

Inventory as of March 31, 2021 and December 31, 2020 consisted of the following:

As of March 31, 

As of December 31, 

2021

2020

Raw materials

$

5,011

$

3,514

Work in process

802

1,096

Finished goods

9,685

11,004

Total inventory

$

15,498

$

15,614

The aggregate charges related to excess inventory for the three months ended March 31, 2021 and 2020 were immaterial. These expenses were recorded as a component of cost of product revenues. During the three months ended March 31, 2021 and 2020, inventory used in the construction and installation of property and equipment was $516 and $394, respectively.