5. Inventory

Inventory consisted of the following:


	As of June 30,		As of December 31,
	2017		2016
Raw materials	$	398	$	294
Work in process		—		67
Finished goods		1,122		955
Total inventory	$	1,520	$	1,316

During the three months ended June 30, 2017, the Company incurred aggregate charges of $257 related to excess inventory compared to zero for the three months ended June 30, 2016. For the six months ended June 30, 2017, the Company incurred aggregate charges of $350 related to excess inventory compared to zero for the six months ended June 30, 2016. These expenses were recorded as a component of cost of product revenues.