Summary of Significant Accounting Policies - Warrants (Details) $ in Thousands	12 Months Ended
	Jan. 28, 2017 USD ($) item shares
Warrants
Warrants	$ 7
Hi-Tec License
Warrants
Warrants to purchase | shares	120,000
Number of tranches warrants vest | item	5
Number of shares vest in each tranches | shares	20,000
Initial term	5 years
Renewal period	5 years
Fair value of stock warrants	$ 567
Warrants	$ 7