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Employee Stock Purchase Plan - Additional Information (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2015
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Number of shares granted under ESPP 800      
Stock-based compensation expense   $ 3,186 $ 2,257 $ 3,293
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage of market value per share fixed as purchase price 85.00%      
Stock-based compensation expense   $ 165 $ 15