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Stock-Based Compensation - Valuation Assumptions - Additional Information (Details) (USD $)
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0 Months Ended |
3 Months Ended |
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Feb. 02, 2015
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Feb. 03, 2014
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Mar. 31, 2015
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Offering period |
2 years |
2 years |
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| Employee Stock Purchase Plan | Minimum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Weighted average estimated fair value of share granted |
3.09 |
2.82 |
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| Employee Stock Purchase Plan | Maximum |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Weighted average estimated fair value of share granted |
4.27 |
4.48 |
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| Nonqualified Stock Option Plan And Employee Stock Purchase | Historical Volatility |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Blended volatility |
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50.00% |
| Nonqualified Stock Option Plan And Employee Stock Purchase | Implied Volatility |
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| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
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| Blended volatility |
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50.00% |