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Income Taxes - Tax Credit Carryforward Narrative (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
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Dec. 31, 2013
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| Income Tax Contingency [Line Items] | |
| Tax credit carryforward, term | 20 years |
|
Internal Revenue Service (IRS)
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|
| Income Tax Contingency [Line Items] | |
| Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ 13.9 |
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State jurisdiction
|
|
| Income Tax Contingency [Line Items] | |
| Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | 13.1 |
|
Research and development | Internal Revenue Service (IRS)
|
|
| Income Tax Contingency [Line Items] | |
| Tax credit carryforward | 6.4 |
| Tax credit carryforward, expiration date | Dec. 31, 2025 |
|
Research and development | State jurisdiction
|
|
| Income Tax Contingency [Line Items] | |
| Tax credit carryforward | $ 6.9 |