Quarterly report pursuant to Section 13 or 15(d)

Capital Stock, Stock Plans, Warrants and Stock-based Compensation - Schedule of Stock Options Roll Forward (Details) (Parenthetical)

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Capital Stock, Stock Plans, Warrants and Stock-based Compensation - Schedule of Stock Options Roll Forward (Details) (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock option exercise price per share lower limit $ 2.79 $ 2.79
Stock option exercise price per share upper limit $ 13.35 $ 14.75