Income Taxes - Carryforwards (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 37.2
Income tax credit carryforwards	3.6
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	85.3
Income tax credit carryforwards	0.4
Switzerland
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	15.0
Italy
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 1.2