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N. SEGMENT AND GEOGRAPHIC INFORMATION (Tables)
12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Revenue and asset information by geographic region

 

 

 

 

 

 

 

 

 

 

 

 

 

For the year ended December 31, 

 

 

    

2016

    

2015

    

2014

 

Revenues:

 

(in thousands)

 

United States

 

$

18,035

 

$

16,766

 

$

30,723

 

Taiwan

 

 

161,611

  

 

141,107

  

 

77,680

 

China

 

 

81,067

  

 

32,030

  

 

22,046

 

 

 

$

260,713

 

$

189,903

 

$

130,449

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

As of December 31, 

 

 

    

2016

    

2015

    

2014

 

Long-lived assets:

 

(in thousands)

 

United States

 

$

66,028

 

$

44,280

 

$

15,875

 

Taiwan

 

 

48,728

  

 

45,420

  

 

35,688

 

China

 

 

34,113

  

 

24,753

  

 

18,008

 

 

 

$

148,869

 

$

114,453

 

$

69,571