Inventories

3 Months Ended

Mar. 31, 2022

Inventory Disclosure [Abstract]

Inventories

4. Inventories

(table only in thousands)	March 31, 2022			December 31, 2021
Raw materials	$	14,835		$	13,405
Work in process		7,187			5,147
Finished goods		2,340			674
Obsolescence allowance		(2,282	)		(2,174	)
Total inventories	$	22,080		$	17,052

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.2 million and $0.1 million for the three-month periods ended March 31, 2022 and 2021, respectively.