Annual report pursuant to Section 13 and 15(d)

Summary of significant accounting policies - Property and Equipment (Details)

v3.20.1
Summary of significant accounting policies - Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 01, 2020
Feb. 02, 2019
Feb. 03, 2018
Property and equipment      
Fixed asset impairment charges $ 0 $ 0 $ 0
Equipment and fixtures | Minimum      
Property and equipment      
Estimated useful lives or the expected lease term 1 year    
Equipment and fixtures | Maximum      
Property and equipment      
Estimated useful lives or the expected lease term 10 years    
Leasehold improvements      
Property and equipment      
Estimated useful lives or the expected lease term 10 years    
Electronic equipment and software | Minimum      
Property and equipment      
Estimated useful lives or the expected lease term 3 years    
Electronic equipment and software | Maximum      
Property and equipment      
Estimated useful lives or the expected lease term 5 years