Quarterly report pursuant to Section 13 or 15(d)

Income (Loss) Per Share - Anti-dilutive common stock equivalents (Details)

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Income (Loss) Per Share - Anti-dilutive common stock equivalents (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 85,805 5,010 65,994 59,908
Restricted Stock Awards | Service-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 9,775   3,466 610
Stock Options        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 76,030 5,010 62,528 59,298