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Segments and Major Customers (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Major Customer Disclosure
Revenue	$ 68,563	$ 59,754	$ 56,458	$ 46,426	$ 101,891	$ 99,134	$ 94,720	$ 97,351	$ 231,201	$ 393,096	$ 336,597
Property, plant and equipment, net	57,028				54,303				57,028	54,303
South Korea
Major Customer Disclosure
Revenue									13,421	115,811	129,542
USA
Major Customer Disclosure
Revenue									129,567	165,263	121,209
Property, plant and equipment, net	50,400				47,200				50,400	47,200
TAIWAN, PROVINCE OF CHINA
Major Customer Disclosure
Revenue									21,749	9,953	6,439
Japan
Major Customer Disclosure
Revenue									23,222	23,378	30,215
Europe
Major Customer Disclosure
Revenue									15,668	22,597	16,031
Canada
Major Customer Disclosure
Revenue									4,960	4,373	3,478
SINGAPORE
Major Customer Disclosure
Revenue									19,140	22,554	17,908
Asia-Other
Major Customer Disclosure
Revenue									3,474	29,167	$ 11,775
India
Major Customer Disclosure
Property, plant and equipment, net	3,800				3,400				3,800	3,400
Other foreign locations
Major Customer Disclosure
Property, plant and equipment, net	$ 2,800				$ 3,700				$ 2,800	$ 3,700

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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