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New Accounting Pronouncement (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Aug. 04, 2018
Aug. 04, 2018
Feb. 04, 2018
Feb. 03, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accumulated deficit $ (62,061) $ (62,061)   $ (50,542)
Deferred revenue 2,600 2,600   $ 5,100
Revenue recognized 900 1,800    
Accrued revenue 900 900 $ 400  
Accrued revenue recognized 300 600    
Aggregate minimum licensing revenue   $ 64,100    
Contractual Rights On Revenue Recognized Period   10 years    
ASU 2014-09 | Adjustment        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Accumulated deficit 300 $ 300    
Revenue $ 300 $ 600