Summary of Significant Accounting Policies (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2013 IPR&D
Summary of Significant Accounting Policies
Impairment of goodwill	$ 0
Evaluation of IPR&D impairment
Impairment charge		$ 0.8

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

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