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Inventory
9 Months Ended
Sep. 30, 2021
Inventory  
Inventory

7. Inventory

Inventory as of September 30, 2021 and December 31, 2020 consisted of the following:

As of September 30, 

As of December 31, 

2021

2020

Raw materials

$

4,216

$

3,514

Work in process

2,443

1,096

Finished goods

10,699

11,004

Total inventory

$

17,358

$

15,614

The aggregate charges related to excess inventory for the three and nine months ended September 30, 2021 and 2020

were immaterial. These expenses were recorded as a component of cost of product revenues. During the three and nine months ended September 30, 2021, inventory used in the construction and installation of property and equipment was zero and $516, respectively. During the three and nine months ended September 30, 2020, inventory used in the construction and installation of property and equipment was $1,199 and $1,812, respectively.