5. Inventory

3 Months Ended

Mar. 31, 2015

Inventory Disclosure [Abstract]

5. Inventory

Inventories consist of the following for the periods indicated (in thousands): 

	March 31, 2015		December 31, 2014
Raw materials	$	16,615	$	16,243
Work in process		20,964		13,379
Finished goods		5,986		4,158
	$	43,565	$	33,780

The lower of cost or market adjustment expensed for inventory for the three months ended March 31, 2015 and 2014 was $0.6 million and $0.3 million, respectively.