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Description of Business and Basis of Presentation (Impact of the Preferred Stock Modification) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Series A, B and C Common Stock        
Class of Stock [Line Items]        
Net income per share, basic (in dollars per share) $ 0.30 $ 0.65 $ 0.31 $ 1.02
Series C-1 Convertible Preferred Stock        
Class of Stock [Line Items]        
Net income per share, basic (in dollars per share) $ 5.73 12.54 $ 5.93 19.65
Pre-Exchange | Series C-1 Convertible Preferred Stock        
Class of Stock [Line Items]        
Net income per share, basic (in dollars per share)   $ 1.30   $ 2.04