2. REVENUE (Tables)

12 Months Ended

May 31, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

    The Company’s revenues by product category are as follows (in thousands):

	Year Ended May 31,
	2019		2018		2017
Type of good / service:
Systems	$	9,566	$	18,174	$	12,115
Contactors		6,154		6,500		1,991
Services		5,336		4,881		4,792
	$	21,056	$	29,555	$	18,898
Product lines:
Wafer-level	$	14,618	$	13,080	$	9,582
Test During Burn-In		6,438		16,475		9,316
	$	21,056	$	29,555	$	18,898

    The following presents information about the Company’s operations in different geographic areas. Net sales are based upon ship-to location (in thousands):

	Year Ended May 31,
	2019		2018		2017
Geographic region:
United States	$	13,468	$	8,446	$	7,762
Asia		5,648		19,973		10,439
Europe		1,940		1,136		697
	$	21,056	$	29,555	$	18,898

    With the exception of the amount of service contracts and extended warranties, the Company’s product category revenues are recognized at point in time when control transfers to customers.

	Year Ended May 31,
	2019		2018		2017
Timing of revenue recognition (in thousands):
Products and services transferred at a point in time	$	18,473	$	27,337	$	17,193
Services transferred over time		2,583		2,218		1,705
	$	21,056	$	29,555	$	18,898