Inventories

9 Months Ended

Sep. 30, 2022

Inventory Disclosure [Abstract]

Inventories

4. Inventories

Inventories consisted of the following:

(in thousands)	September 30, 2022			December 31, 2021
Raw materials	$	18,125		$	13,405
Work in process		6,925			5,147
Finished goods		2,508			674
Obsolescence allowance		(2,818	)		(2,174	)
Total inventories	$	24,740		$	17,052

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to zero and $0.2 million for the three months ended September 30, 2022 and 2021, respectively, and $0.1 million and $0.4 million for the nine months ended September 30, 2022 and 2021, respectively.