STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	375	301
Shares, Granted	92	97
Shares, Vested	(33)	(125)
Shares, Forfeitures	(28)
Shares, Non-vested, Ending balance	406	273
Weighted Average Fair Value, Non-vested, Beginning balance	$ 10.05	$ 13.55
Weighted Average Fair Value, Granted	11.68	8.74
Weighted Average Fair Value, Vested	8.74	16.19
Weighted Average Fair Value, Forfeitures	11.27
Weighted Average Fair Value, Non-vested, Ending balance	$ 10.50	$ 10.64