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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 430,329 275,601 499,024 92,877
Restricted Stock Awards | Service-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 11,812 29,475 41,261 9,933
Restricted Stock Awards | Market-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents     8,431  
Stock Options        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 418,517 246,126 449,332 82,944