4. BALANCE SHEET DETAIL - Property and equipment, net (Details) - USD ($)	3 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Property and equipment, net:
Property and equipment, gross	$ 31,743,000		$ 31,712,000
Less: Accumulated depreciation	(23,017,000)		(22,711,000)
Total property and equipment, net	8,726,000		9,001,000
Depreciation	306,000	$ 251,000
Computer and other equipment
Property and equipment, net:
Property and equipment, gross	19,117,000		19,086,000
Software
Property and equipment, net:
Property and equipment, gross	4,058,000		4,058,000
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	3,718,000		3,718,000
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	$ 848,000		$ 848,000