Inventories

9 Months Ended

Sep. 30, 2020

Inventory Disclosure [Abstract]

Inventories

4. Inventories

(table only in thousands)	September 30, 2020			December 31, 2019
Raw materials	$	14,544		$	15,218
Work in process		6,688			7,328
Finished goods		437			654
Obsolescence allowance		(3,119	)		(2,622	)
Total inventories	$	18,550		$	20,578

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 September 30, 2020 and 2019, respectively and $0.5 million for the nine-month periods ended September 30, 2020 and 2019.