Company and Industry Information Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	$ 194,051	$ 149,176	$ 150,540
Long-lived assets	35,298	39,929	45,938
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	24,871	28,297	47,629
Long-lived assets	30,760	34,124	39,577
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	120,690	67,927	45,227
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	6,605	4,420	25,752
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	14,578	15,639	17,688
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	9,577	13,528	5,036
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	3,836	5,049	5,367
International Subtotal [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	169,180	120,879	102,911
Rest of the world [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net	17,730	19,365	9,208
Long-lived assets	$ 702	$ 756	$ 994