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SIGNIFICANT CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Sales, net	$ 389,521	$ 175,127	$ 1,044,857	$ 450,680
Product [Member]
Revenue, Major Customer [Line Items]
Sales, net	358,257	148,138	959,388	366,443
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 65,740	$ 38,957	$ 181,129	$ 108,978
Significant concentration risk, 10% or more of total balance	16.90%	22.20%	17.30%	24.20%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Lam Research [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 40,798	$ 21,991		$ 61,364
Significant concentration risk, 10% or more of total balance	10.50%	12.60%		13.60%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance			16.20%		14.90%
Accounts receivable	$ 39,015		$ 39,015		$ 36,849
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Nidec Motor Corporation [Member]
Revenue, Major Customer [Line Items]
Significant concentration risk, 10% or more of total balance					15.40%
Accounts receivable					$ 38,071

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

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