STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	467
Shares, Granted	32
Shares, Vested	(117)
Shares, Forfeitures	(3)
Shares, Non-vested, Ending balance	379
Shares, Non-vested	379	557
Weighted Average Fair Value, Non-vested, Beginning balance	$ 8.01
Weighted Average Fair Value, Granted	11.12
Weighted Average Fair Value, Vested	8.06
Weighted Average Fair Value, Forfeitures	8.67
Weighted Average Fair Value, Non-vested, Ending balance	8.25
Weighted Average Fair Value, Non-vested	$ 8.25	$ 8.42