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Leases - Additional Information (Detail) - USD ($)
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Lessee, Operating Lease, Option to Extend options to extend the lease term for periods of up to five years  
Lease expense, related party $ 63,000 $ 63,000
Operating Lease, Weighted Average Remaining Lease Term 5 years 2 months 12 days  
Operating Lease, Weighted Average Discount Rate, Percent 4.00%  
Maximum [Member]    
Operating Lease Remaining Lease Term 8 years  
Minimum [Member]    
Operating Lease Remaining Lease Term 1 year