Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of inventories

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

	September 30, 2018		December 31, 2017
Raw materials	$	27,343	$	26,648
Work in process and sub-assemblies		64,994		31,060
Finished goods		15,568		18,060
Total inventory	$	107,905	$	75,768