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Net Loss Per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Mar. 31, 2017
Jun. 30, 2017
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) | Non-Employee Director    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vested and remaining outstanding (in shares) 387,000 988,000