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Net Income (Loss) Per Share - Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Antidilutive securities excluded from computation of earnings per share, amount (in shares)     0  
Unvested restricted shares excluded from earnings per share computation (in shares)     0  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vested and remaining outstanding (in shares) 988,000 387,000 988,000 387,000