Inventories

6 Months Ended

Jun. 30, 2021

Inventory Disclosure [Abstract]

Inventories

4. Inventories

(table only in thousands)	June 30, 2021			December 31, 2020
Raw materials	$	13,995		$	14,262
Work in process		5,595			5,594
Finished goods		528			496
Obsolescence allowance		(2,847	)		(3,009	)
Total inventories	$	17,271		$	17,343

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.1 million and $0.2 million for the three-month periods ended June 30, 2021 and 2020, respectively and $0.2 million and $0.3 million for the six-month periods ended June 30, 2021 and 2020, respectively.