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Stock-Based Compensation - Additional Information (Details)
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3 Months Ended |
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Mar. 31, 2015
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Jun. 07, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common shares reserved for issuance under stock-based employee compensation program |
4,943,170 |
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| Common stock available for issuance under Equity Plan |
552,234 |
1,422,130 |
| Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
4 years |
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| Restricted Stock [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
4 years |
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| Performance Stock Awards [Member] | Granted Prior to 2015 [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
2 years |
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| Performance Stock Awards [Member] | Granted Prior to 2015 [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
3 years |
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| Performance Stock Awards [Member] | Granted in 2015 [Member] | Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
3 years |
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| Performance Stock Awards [Member] | Granted in 2015 [Member] | Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Vesting period, in years |
4 years |
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