Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details)

v3.19.1
Stockholders' Equity (Details) - $ / shares
12 Months Ended
Feb. 03, 2019
Feb. 04, 2018
Warrants 1,067,475 930,054
Warrants [Member] | April 19, 2018 [Member]    
Warrants 798,795  
Expected dividend yield 0.00%  
Expected term (in years) 3 years 1 month 6 days  
Exercise price $ 14.80  
Calculated fair value of warrant $ 3.12  
Warrants [Member] | April 19, 2018 [Member] | Minimum [Member]    
Expected volatility 41.40%  
Risk-free interest rate 1.70%  
Warrants [Member] | April 19, 2018 [Member] | Maximum [Member]    
Expected volatility 43.70%  
Risk-free interest rate 2.00%  
Warrants [Member] | June 29, 2018 [Member]    
Warrants 798,795  
Expected volatility 42.00%  
Expected dividend yield 0.00%  
Expected term (in years) 3 years  
Risk-free interest rate 2.60%  
Exercise price $ 16.00  
Calculated fair value of warrant $ 5.00  
Warrants [Member] | June 29, 2018 [Member]    
Warrants 281,750  
Expected volatility 41.30%  
Expected dividend yield 0.00%  
Expected term (in years) 5 years  
Risk-free interest rate 2.70%  
Exercise price $ 19.20  
Calculated fair value of warrant $ 8.84  
Warrants [Member] | September 26, 2018 [Member]    
Warrants 56,077  
Expected volatility 43.80%  
Expected dividend yield 0.00%  
Expected term (in years) 3 years  
Risk-free interest rate 2.69%  
Exercise price $ 9.13  
Calculated fair value of warrant $ 12.87