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Segments and Major Customers (Details 3) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Major Customer Disclosure
Revenue	$ 61,913	$ 56,915	$ 61,717	$ 65,777	$ 61,735	$ 59,187	$ 58,297	$ 48,384	$ 127,494	$ 184,409	$ 165,868	$ 246,322	$ 227,603	$ 231,201
Property, plant and equipment, net	57,693	$ 59,425	$ 50,858	$ 48,154	45,536	$ 38,571			$ 50,858	$ 59,425	$ 38,571	57,693	45,536
South Korea
Major Customer Disclosure
Revenue												3,664	3,583	13,421
USA
Major Customer Disclosure
Revenue												137,614	134,526	129,567
Property, plant and equipment, net	53,200				41,100							53,200	41,100
TAIWAN, PROVINCE OF CHINA
Major Customer Disclosure
Revenue												21,803	24,118	21,749
Japan
Major Customer Disclosure
Revenue												20,437	15,453	23,222
Europe
Major Customer Disclosure
Revenue												7,359	10,262	15,668
Canada
Major Customer Disclosure
Revenue												1,162	3,554	4,960
SINGAPORE
Major Customer Disclosure
Revenue												28,034	21,751	19,140
Asia-Other
Major Customer Disclosure
Revenue												26,249	14,356	$ 3,474
India
Major Customer Disclosure
Property, plant and equipment, net	3,300				3,400							3,300	3,400
Other foreign locations
Major Customer Disclosure
Property, plant and equipment, net	$ 1,200				$ 1,000							$ 1,200	$ 1,000

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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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