SIGNIFICANT CUSTOMER INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue, Major Customer [Line Items]
Sales, net	$ 339,880	$ 134,810	$ 655,336	$ 275,553
Product [Member]
Revenue, Major Customer [Line Items]
Sales, net	311,770	106,193	601,131	218,305
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Applied Materials, Inc. [Member]
Revenue, Major Customer [Line Items]
Sales, net	$ 64,408	$ 33,731	$ 115,389	$ 70,021
Significant concentration risk, 10% or more of total balance	19.00%	25.00%	17.60%	25.40%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Lam Research [Member]
Revenue, Major Customer [Line Items]
Sales, net		$ 19,802		$ 39,373
Significant concentration risk, 10% or more of total balance		14.70%		14.30%
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			18.10%		14.90%
Accounts receivable	$ 42,541		$ 42,541		$ 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