Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ (514)	$ (568)
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	$ 514	$ 592