3. REVENUE (Tables)

9 Months Ended

Feb. 28, 2019

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

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

	Three Months Ended				Nine Months Ended
	February 28,				February 28,
	2019		2018		2019		2018
Type of good / service:
Systems	$	404	$	4,345	$	5,922	$	12,851
Contactors		1,445		747		3,541		5,291
Services		1,314		2,301		4,351		4,144
	$	3,163	$	7,393	$	13,814	$	22,286
Product lines:
Wafer-level	$	2,046	$	2,934	$	8,240	$	9,898
Test During Burn-In		1,117		4,459		5,574		12,388
	$	3,163	$	7,393	$	13,814	$	22,286

    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				Nine Months Ended
	February 28,				February 28,
	2019		2018		2019		2018
Geographic region:
United States	$	2,203	$	1,493	$	9,407	$	4,747
Asia		746		4,974		3,814		16,543
Europe		214		926		593		996
	$	3,163	$	7,393	$	13,814	$	22,286

  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				Nine Months Ended
	February 28,				February 28,
	2019		2018		2019		2018
Timing of revenue recognition:
Products and services transferred at a point in time	$	2,507	$	6,805	$	11,897	$	20,692
Services transferred over time		656		588		1,917		1,594
	$	3,163	$	7,393	$	13,814	$	22,286