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
Mar. 31, 2018
Mar. 31, 2017
Anti-dilutive common stock equivalents    
Total anti-dilutive common stock equivalents 35,480 1,381,859
Restricted Stock Awards | Service-based conditions    
Anti-dilutive common stock equivalents    
Total anti-dilutive common stock equivalents 275 401,623
Restricted Stock Awards | Market-based conditions    
Anti-dilutive common stock equivalents    
Total anti-dilutive common stock equivalents   205,316
Stock Options    
Anti-dilutive common stock equivalents    
Total anti-dilutive common stock equivalents 35,205 774,920