Inventories

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Inventories

5. Inventories

(table only in thousands)	March 31, 2019			December 31, 2018
Raw materials	$	15,867		$	15,819
Work in process		5,392			6,098
Finished goods		748			807
Obsolescence allowance		(2,227	)		(1,907	)
Total inventories	$	19,780		$	20,817

Amounts credited to the allowance for obsolete inventory and charged to cost of sales amounted to $0.2 million and $0.3 million for the three-month periods ended March 31, 2019 and 2018, respectively.