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Acquisitions - Pro Forma (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Combinations [Abstract]    
Revenue $ 438.6 $ 399.0
Net loss $ (10.9) $ (17.2)
Loss per share - basic and diluted (in USD per share) $ (0.16) $ (0.35)