Quarterly report pursuant to Section 13 or 15(d)

Operating leases - Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Detail)

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Operating leases - Schedule of Supplemental Balance Sheet Information Related to Operating Leases (Detail) - USD ($)
$ in Thousands
Apr. 30, 2019
Feb. 01, 2019
Leases [Abstract]    
Operating lease right-of-use assets $ 1,964 $ 1,700
Current portion, operating lease liabilities 709  
Operating lease liabilities 1,255  
Total operating lease liabilities $ 1,964 $ 1,700
Weighted average remaining lease term 3 years 2 months 12 days  
Weighted average incremental borrowing rate 7.00%