Inventories

3 Months Ended

Mar. 31, 2021

Inventory Disclosure [Abstract]

Inventories

4. Inventories

(table only in thousands)	March 31, 2021			December 31, 2020
Raw materials	$	13,591		$	14,262
Work in process		5,208			5,594
Finished goods		643			496
Obsolescence allowance		(3,044	)		(3,009	)
Total inventories	$	16,398		$	17,343

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.1 million for the three-months ended March 31, 2021 and 2020.