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Segments and Major Customers (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Major Customer Disclosure
Revenue	$ 59,947	$ 57,399	$ 58,297	$ 48,384	$ 68,563	$ 59,754	$ 56,458	$ 46,426	$ 224,027	$ 231,201	$ 393,096
Property, plant and equipment, net	44,714				57,028				44,714	57,028
South Korea
Major Customer Disclosure
Revenue									3,583	13,421	115,811
USA
Major Customer Disclosure
Revenue									134,526	129,567	165,263
Property, plant and equipment, net	40,300				50,400				40,300	50,400
TAIWAN, PROVINCE OF CHINA
Major Customer Disclosure
Revenue									24,118	21,749	9,953
Japan
Major Customer Disclosure
Revenue									11,877	23,222	23,378
Europe
Major Customer Disclosure
Revenue									10,262	15,668	22,597
Canada
Major Customer Disclosure
Revenue									3,554	4,960	4,373
SINGAPORE
Major Customer Disclosure
Revenue									21,751	19,140	22,554
Asia-Other
Major Customer Disclosure
Revenue									14,356	3,474	$ 29,167
India
Major Customer Disclosure
Property, plant and equipment, net	3,400				3,800				3,400	3,800
Other foreign locations
Major Customer Disclosure
Property, plant and equipment, net	$ 1,000				$ 2,800				$ 1,000	$ 2,800

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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