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Acquisitions - Pro forma Financial Information (Details) - CTRM Business
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
$ / shares
Business Acquisition [Line Items]  
Pro forma revenue $ 44,906
Pro forma net income (loss) $ (30,115)
Pro forma net income (loss) per share - basic and diluted (in dollars per share) | $ / shares $ (3.10)