Inventories, Net (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories, Net

	December 31,		September 30,
	2017		2018
	(In thousands)
Raw materials	$	2,730	$	3,001
Work in process		9,836		10,864
Finished products		2,816		3,294
Total	$	15,382	$	17,159