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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 76,698 97,196 56,089 87,358
Restricted Stock Awards | Service-based conditions        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 349 985 312 916
Stock Options        
Anti-dilutive common stock equivalents        
Total anti-dilutive common stock equivalents 76,349 96,211 55,777 86,442