2. Inventories, net

12 Months Ended

Dec. 31, 2019

Inventory Disclosure [Abstract]

2. Inventories, net

Inventories, which are presented net of allowance for obsolete and slow-moving inventory, consisted of the following:

	December 31,
	2019		2018
Finished goods	$	3,864	$	2,004
Work in process		6,122		5,750
Raw materials		3,527		3,712
	$	13,513	$	11,466

Changes in the allowance for obsolete and slow-moving inventory are as follows:

	Years Ended December 31,
	2019		2018
Balance, beginning of year	$	629	$	789
Charged to cost of sales		194		(38	)
Disposal of inventory		—		(122	)
Balance, end of year	$	823	$	629

For the year ended December 31, 2018, the Company wrote off obsolete inventory that had been fully allowed for previously, which had no material impact to the Company’s consolidated balance sheets or consolidated statements of operations.