Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Capital Stock, Stock Plans, Warrants and Stock-based Compensation - Schedule of Stock Options Roll Forward (Details) (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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