Inventory

3 Months Ended

Mar. 31, 2020

Inventory

Inventory

7. Inventory

Inventory as of March 31, 2020 and December 31, 2019 consisted of the following:

	As of March 31,		As of December 31,
	2020		2019
Raw materials	$	5,626	$	795
Work in process		1,685		1,427
Finished goods		8,652		7,421
Total inventory	$	15,963	$	9,643

The aggregate charges related to excess inventory for the three months ended March 31, 2020 and 2019 were immaterial. These expenses were recorded as a component of cost of product revenues. During the three months ended March 31, 2020 and 2019, inventory used in the construction and installation of property and equipment was $394 and $0, respectively.