Inventories

12 Months Ended

Dec. 31, 2020

Inventory Disclosure [Abstract]

Inventories

4.Inventories

Inventories consisted of the following:

	December 31,
(table only in thousands)	2020			2019
Raw materials	$	14,262		$	15,218
Work in process		5,594			7,328
Finished goods		496			654
Obsolescence allowance		(3,009	)		(2,622	)
Total inventories	$	17,343		$	20,578

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.5 million, $0.3 million and $0.5 million during 2020, 2019 and 2018, respectively. Items charged to the allowance for inventory write-offs were $0.1 million, $0.1 million and $0.3 million, during 2020, 2019 and 2018, respectively.