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GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION (Tables)
12 Months Ended
Dec. 31, 2020
GEOGRAPHIC AND SIGNIFICANT CUSTOMER INFORMATION  
Schedules of concentration of risk, by risk factor

Years Ended December 31, 

    

2020

    

2019

    

2018

Applied Materials, Inc.

$

248,350

    

17.5

%  

$

164,724

    

20.9

%  

$

258,027

    

35.9

%  

Lam Research

 

141,778

 

10.0

%  

 

88,251

 

11.2

%  

 

109,005

 

15.2

%  

    

December 31,

2020

2019

Applied Materials, Inc.

$

33,402

    

14.2

%

  

$

36,849

    

14.9

%

Nidec Motor Corporation

24,344

10.4

%

  

38,071

15.4

%

Schedule of long-lived assets by geographic area

December 31, 

    

2020

    

2019

United States

$

253,115

$

239,511

Asia

 

283,549

 

301,020

Europe

 

60,847

 

59,925

Total

$

597,511

$

600,456