INCOME TAXES - Income Tax Expense Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2022	Jul. 31, 2021	Jul. 31, 2022	Jul. 31, 2021	Jan. 31, 2022
INCOME TAXES
Federal corporate income tax rate (as percent)			21.00%		21.00%
Computed expected income tax expense			$ (4,970)	$ (6,635)
State income taxes, net of federal tax effect			(349)	(719)
Research and development credits adjustment			(6,181)
Deferred tax adjustments			(66)	(283)
Other permanent differences and adjustments, net			(393)	(322)
Income tax expense	$ (9,686)	$ (4,191)	$ (11,959)	$ (7,959)