INCOME TAXES (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Feb. 28, 2021	Feb. 29, 2020
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 27,194	$ 22,500
Depreciation, amortization and impairments	(2,117)	(5,353)
Research and development credits	21,917	20,603
Stock-based compensation	2,944	2,556
Other tax credits	2,197	2,172
Capitalized research costs	2,638	3,389
ROU asset	(3,528)	(5,174)
Lease liabilities	5,472	7,455
Payroll and employee benefit accruals	1,984	2,077
Allowance for doubtful accounts	1,163	965
Other accrued liabilities	4,743	4,887
Convertible debt	(8,185)	(9,477)
Other, net	5,137	3,275
Gross deferred tax assets	61,559	49,875
Valuation allowance	(56,848)	(45,560)
Net deferred tax assets	4,711	4,315
Reported as:
Deferred tax assets	4,889	4,437
Deferred tax liabilities	(178)	(122)
Net deferred tax assets	$ 4,711	$ 4,315