Inventories, Net (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventories, Net

	December 31,		March 31,
	2018		2019
	(In thousands)
Raw materials	$	2,661	$	3,316
Work in process		11,130		11,849
Finished products		3,311		3,345
Total	$	17,102	$	18,510