INCOME TAXES (Deferred Tax Assets) (Details) - USD ($) $ in Thousands	Feb. 29, 2020	Feb. 28, 2019
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 22,500	$ 19,269
Depreciation, amortization and impairments	(10,528)	(11,945)
Research and development credits	20,603	19,189
Stock-based compensation	2,556	2,783
Other tax credits	2,172	1,018
Capitalized research costs	3,389
Lease liabilities	7,455
Payroll and employee benefit accruals	2,077	2,220
Allowance for doubtful accounts	965	454
Other accrued liabilities	4,887	6,208
Convertible debt	(9,477)	(10,822)
Other, net	3,276	4,218
Gross deferred tax assets	49,875	32,592
Valuation allowance	(45,560)	(10,929)
Net deferred tax assets	4,315	21,663
Reported as:
Deferred tax assets	4,437	22,626
Deferred tax liabilities	(122)	(963)
Net deferred tax assets	$ 4,315	$ 21,663