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Summary of Significant Accounting Policies (Details 7)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jan. 31, 2015
$ / shares
shares
Jun. 30, 2015
Aug. 01, 2015
USD ($)
item
$ / shares
shares
Aug. 02, 2014
USD ($)
Feb. 01, 2013
$ / shares
Stock-Based Compensation          
Closing share price (in dollars per share)         $ 13.95
Compensation expense (in dollars) | $     $ 943 $ 424  
Performance-Based Equity Awards          
Stock-Based Compensation          
Target growth rate (as a percent)     10.00%    
Target share price for fiscal year 2014 (in dollars per share)     $ 15.35    
Target share price for fiscal year 2015 (in dollars per share)     16.88    
Target share price for fiscal year ending in 2016 (in dollars per share)     $ 18.57    
Award vesting percentage     33.33%    
Percentage of shares vesting 66.67%        
Number of increments in which award will vest | item     5    
Restricted Stock Units | Non-employee Director          
Stock-Based Compensation          
Maximum percentage of compensation to be paid in equity     100.00%    
Vesting period     1 year    
Restricted Stock Units And Stock Options | Board of Directors and Executive Officers          
Stock-Based Compensation          
Vesting period   3 years      
Restricted Stock and Performance Stock Units          
Stock-Based Compensation          
Compensation expense (in dollars) | $     $ 488 $ 96  
Number of Shares          
Unvested stock at the beginning of the period (in shares) | shares     76,936    
Granted (in shares) | shares     160,000    
Vested (in shares) | shares     (20,789)    
Unvested stock at the end of the period (in shares) | shares 76,936   216,147    
Weighted Average Grant-Date Fair Value          
Unvested stock at the beginning of the period (in dollars per share)     $ 13.02    
Granted (in dollars per share)     22.94    
Vested (in dollars per share)     15.44    
Unvested stock at the end of the period (in dollars per share) $ 13.02   $ 20.13    
Unrecognized stock-based compensation          
Unrecognized stock-based compensation expense (in dollars) | $     $ 231    
Weighted average period for recognition of unrecognized stock-based compensation expense     2 years 4 months 24 days