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Net Loss Per Common Share - Common Stock Equivalent Shares Excluded from Computation of Diluted Loss Per Share (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of earnings per share (in shares) 10,000 10,000 10,000 10,000