INVENTORIES

Inventories consisted of the following at March 31, 2018 and December 31, 2017:



	As of March 31,		As of December 31,
	2018		2017
Raw materials	$	695,474	$	688,904
Work in process	5,106		11,878
Finished goods	373,739		337,072
Total	$	1,074,319	$	1,037,854

The Company analyzes its inventory for impairment, both categorically and as a group, whenever events or changes in circumstances indicate that the carrying amount of the inventory may not be recoverable. During the three months ended March 31, 2018, the Company did not impair inventory, compared to an impairment of $363,758, for the three months ended March 31, 2017.

Inventory amounts are shown net of allowance of $458,097 and $562,140 for the three months ended March 31, 2018 and the year ended December 31, 2017, respectively.