6. BALANCE SHEET DETAIL (Tables)

12 Months Ended

May 31, 2019

Balance Sheet Related Disclosures [Abstract]

Inventories

    INVENTORIES:

	May 31,
(In Thousands)	2019		2018
Raw materials and sub-assemblies	$	5,471	$	5,747
Work in process		3,580		3,068
Finished goods		10		234
	$	9,061	$	9,049

Property and equipment, net

    PROPERTY AND EQUIPMENT, NET:

	May 31,
(In Thousands)	2019			2018
Leasehold improvements	$	1,154		$	1,154
Furniture and fixtures		983			984
Machinery and equipment		3,097			2,865
Test equipment		2,604			2,595
		7,838			7,598
Less: Accumulated depreciation and amortization		(6,793	)		(6,395	)
	$	1,045		$	1,203

Accrued expenses

    ACCRUED EXPENSES:

	May 31,
(In Thousands)	2019		2018
Payroll related	$	990	$	1,014
Restructuring		408		—
Commissions and bonuses		168		101
Professional services		162		163
Warranty		154		135
Material purchases		65		—
Taxes payable		29		34
Investor relations		19		19
Accrued interest		—		139
Other		39		41
	$	2,034	$	1,646

Customer deposits and deferred revenue, short-term

    CUSTOMER DEPOSITS AND DEFERRED REVENUE, SHORT-TERM:

	May 31,
(In Thousands)	2019		2018
Customer deposits	$	1,003	$	1,340
Deferred revenue		542		290
	$	1,545	$	1,630