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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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