Fair Value Measurements - Additional Information (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
---|---|---|
Mar. 31, 2014
|
Dec. 31, 2013
|
|
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Stock Price Change, Percent | 28.00% | |
Debt discount | $ 52.4 | $ 52.4 |
Change in the fair value of the call option feature | 0.2 | |
3.75% Convertible Notes | Investor
|
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
Principal Amount Of Modified Debt Held | $ 59.5 | $ 59.5 |