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Property and Equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]          
Depreciation $ 0.4 $ 1.0 $ 0.8 $ 1.9  
Information technology          
Property, Plant and Equipment [Line Items]          
Assets not yet placed into service $ 0.5   $ 0.5   $ 0.4