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Variable Interest Entity (Details) (Variable Interest Entity, Primary Beneficiary, USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Mar. 01, 2012
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Dec. 16, 2011
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Variable Interest Entity, Primary Beneficiary
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| Variable Interest Entity [Line Items] | |||
| Initial capital contribution | $ 5.0 | ||
| Ownership percentage | 40.00% | 20.00% | |
| Additional capital contribution due to achievement of milestones | 5.0 | ||
| Minimum purchase price to exercise all call options on outstanding interest | $ 50.0 |