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Share-Based Compensation - Summary of Stock Option Activity for Both Employees and Non-employees (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Oct. 28, 2017
Jan. 28, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Stock Options, Outstanding at beginning of period 225,812  
Stock Options, Granted 17,150  
Stock Options, Forfeited or expired (70,323)  
Stock Options, Outstanding at end of period 172,639 225,812
Stock Options, Vested and exercisable at October 28, 2017 71,575  
Weighted Average Exercise Price, Outstanding at beginning of period $ 45.27  
Weighted Average Exercise Price, Granted 10.36  
Weighted Average Exercise Price, Forfeited or expired 42.76  
Weighted Average Exercise Price, Outstanding at end of period 42.83 $ 45.27
Weighted Average Exercise Price, Vested and exercisable at October 28, 2017 $ 44.77  
Weighted Average Remaining Contractual Term (years), Outstanding 8 years 3 months 19 days 8 years 10 months 24 days
Weighted Average Remaining Contractual Term (years), Outstanding, Vested and exercisable at October 28, 2017 8 years 1 month 6 days  
Aggregate Intrinsic Value, Vested and exercisable at October 28, 2017 $ 0