STOCK-BASED COMPENSATION - Summary of Change in Number of Non-Vested Options to Purchase Shares of Common Stock (Details) - $ / shares shares in Thousands	9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
STOCK-BASED COMPENSATION
Shares, Non-vested, Beginning balance	375	302
Shares, Granted	168	192
Shares, Vested	(57)	(125)
Shares, Forfeitures	(28)
Shares, Non-vested, Ending balance	458	369
Weighted Average Fair Value, Non-vested, Beginning balance	$ 10.05	$ 13.55
Weighted Average Fair Value, Granted	10.32	9.35
Weighted Average Fair Value, Vested	9.28	16.19
Weighted Average Fair Value, Forfeitures	10.47
Weighted Average Fair Value, Non-vested, Ending balance	$ 10.22	$ 10.47