STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	375	302	270
Shares, Granted	238	257	302
Shares, Vested	(134)	(184)	(260)
Shares, Forfeitures	(31)		(10)
Shares, Non-vested, Ending balance	448	375	302
Weighted Average Fair Value, Non-vested, Beginning balance	$ 10.05	$ 13.55	$ 14.93
Weighted Average Fair Value, Granted	9.60	9.31	13.55
Weighted Average Fair Value, Vested	10.25	14.75	15.31
Weighted Average Fair Value, Forfeitures	10.28		19.14
Weighted Average Fair Value, Non-vested, Ending balance	$ 9.74	$ 10.05	$ 13.55