Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories, net of inventory writedowns, consist of the following for the periods indicated (in thousands):

	June 30, 2018		December 31, 2017
Raw materials	$	27,078	$	26,648
Work in process and sub-assemblies		48,068		31,060
Finished goods		18,123		18,060
	$	93,269	$	75,768