4. BALANCE SHEET DETAIL - Property and equipment, net (Details) - USD ($)	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020
Property and equipment, net:
Property and equipment, gross	$ 30,935,000		$ 30,888,000
Less: Accumulated depreciation	(23,065,000)		(22,769,000)
Total property and equipment, net	7,870,000		8,119,000
Depreciation	296,000	$ 306,000
Computer and other equipment
Property and equipment, net:
Property and equipment, gross	18,237,000		18,191,000
Software
Property and equipment, net:
Property and equipment, gross	4,086,000		4,086,000
Land
Property and equipment, net:
Property and equipment, gross	3,900,000		3,900,000
Building and building improvements
Property and equipment, net:
Property and equipment, gross	3,735,000		3,735,000
Furniture and fixtures
Property and equipment, net:
Property and equipment, gross	102,000		102,000
Leasehold improvements
Property and equipment, net:
Property and equipment, gross	$ 875,000		$ 874,000