INCOME TAXES - Reconciliation of the beginning and ending amounts of gross unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at February 1,	$ 2,111		$ 82
Additions for tax positions of prior years	182	$ 2,111
Lapses of statutes of limitations			$ (82)
Balance at January 31,	$ 2,293	$ 2,111