Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Inventories

5. Inventories

(table only in thousands)	June 30, 2019			December 31, 2018
Raw materials	$	16,747		$	15,819
Work in process		7,345			6,098
Finished goods		756			807
Obsolescence allowance		(2,472	)		(1,907	)
Total inventories	$	22,376		$	20,817

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 June 30, 2019 and 2018, respectively, and $0.4 million for the six-month periods ended June 30, 2019 and 2018.