Segment Reporting (Tables)

12 Months Ended

Jan. 31, 2019

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.

	Year Ended January 31,
	2019		2018		2017
	(in thousands)
Taiwan	$	132,199	$	174,486	$	185,225
Asia Pacific		66,981		57,862		42,461
Europe		18,244		45,185		71,556
North America other than United States		7,028		11,110		3,686
United States		3,316		6,759		7,369
Total revenue	$	227,768	$	295,402	$	310,297