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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Feb. 01, 2015	Feb. 02, 2014	Feb. 01, 2016
Catalog and advertising expenses	$ 65,200	$ 49,400	$ 37,300
Shipping and processing expenses	20,400	16,300	11,700
Depreciation and amortization	2,837	1,821	1,247
Goodwill impairment loss	0	0	0
Amortization expense of other assets	100	100	$ 10
Accumulated amortization of other assets	$ 200	$ 100
Inventory Expenditures [Member] | Supplier One [Member]
Concentration risk, percentage	54.00%	59.00%	51.00%
Inventory Expenditures [Member] | Supplier Two [Member]
Concentration risk, percentage	17.00%	16.00%	15.00%
Minimum [Member]
Amortization period of capitalized deferred catalog costs	3 months
Other assets amortization estimated useful life	4 years
Maximum [Member]
Amortization period of capitalized deferred catalog costs	5 months
Other assets amortization estimated useful life	15 years
Restricted Stock [Member]
Stock compensation expense	$ 700	$ 70	$ 80
Unrecognized compensation expense	$ 1,800
Unrecognized compensation expense, weighted average recognition period	2 years 4 months 24 days
Restricted Stock [Member] | Board Members [Member]
Stock-based compensation, vesting period	1 year
Restricted Stock [Member] | Key Employees And Executives [Member] | Minimum [Member]
Stock-based compensation, vesting period	2 years
Restricted Stock [Member] | Key Employees And Executives [Member] | Maximum [Member]
Stock-based compensation, vesting period	5 years
IPO [Member] | 2015 Equity Incentive Plan [Member]
Percentage increase on number of shares reserved for future issuance	1.25%
Class B common stock [Member] | IPO [Member] | 2015 Equity Incentive Plan [Member]
Number of common stock shares reserved for issuance of awards	1,614,631
Class B common stock [Member] | IPO [Member] | 2015 Equity Incentive Plan [Member] | Subsequent Event [Member]
Number of common stock shares reserved for issuance of awards				2,018,580

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