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Segment Reporting (Tables)
 6 Months Ended
Jul. 31, 2018
Segment Reporting [Abstract]  
Company's Revenue by Geographic Region Based on Bill-to Location

The following table sets forth the Company’s revenue by geographic region based on bill-to location for the periods indicated:

 

 

 

Three Months Ended July 31,

 

 

Six Months Ended July 31,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

 

 

(in thousands)

 

Taiwan

 

$

39,144

 

 

$

48,052

 

 

$

72,350

 

 

$

94,468

 

Asia Pacific

 

 

18,045

 

 

 

12,291

 

 

 

34,401

 

 

 

24,050

 

Europe

 

 

2,875

 

 

 

6,444

 

 

 

7,457

 

 

 

8,344

 

North America other than United States

 

 

1,503

 

 

 

2,979

 

 

 

3,509

 

 

 

4,984

 

United States

 

 

907

 

 

 

1,864

 

 

 

1,695

 

 

 

3,919

 

Total revenue

 

$

62,474

 

 

$

71,630

 

 

$

119,412

 

 

$

135,765