3. REVENUE (Tables)

6 Months Ended

Nov. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2018		2017		2018		2017
Type of good / service:
Systems	$	3,712	$	5,030	$	5,518	$	8,506
Contactors		943		1,867		2,096		4,544
Services		1,256		1,026		3,037		1,843
	$	5,911	$	7,923	$	10,651	$	14,893
Product lines:
Wafer-level	$	4,226	$	2,812	$	6,195	$	6,965
Test During Burn-In		1,685		5,111		4,456		7,928
	$	5,911	$	7,923	$	10,651	$	14,893

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

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2018		2017		2018		2017
Geographic region:
United states	$	4,509	$	1,964	$	7,204	$	3,254
Asia		1,334		5,909		3,068		11,569
Europe		68		50		379		70
	$	5,911	$	7,923	$	10,651	$	14,893

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.

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2018		2017		2018		2017
Timing of revenue recognition:
Products and services transferred at a point in time	$	5,272	$	7,387	$	9,390	$	13,887
Services transferred over time		639		536		1,261		1,006
	$	5,911	$	7,923	$	10,651	$	14,893