Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Details 4)

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Stockholders' Equity (Details 4) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Granted (in shares)   164,976
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding at Beginning of the period (in shares) 720,000 623,000
Number of Options, Granted (in shares) 258,000 165,000
Number of Options, Exercised (in shares) 0 0
Number of Options, Forfeited (in shares) (168,000) (68,000)
Number of Options, Outstanding at End of the period (in shares) 810,000 720,000
Number of Options, Exercisable, December 31, 2017 (in shares) 658,000  
Weighted Average Exercise Price, Outstanding, Beginning of the period, (in dollars per share) $ 52.90 $ 62.60
Weighted Average Exercise Price, Granted (in dollars per share) 3.53 10.5
Weighted Average Exercise Price, Exercised (in dollars per share) 0 0
Weighted Average Exercise Price, Forfeited (in dollars per share) 40.6 39.5
Weighted Average Exercise Price, Outstanding, End of the period, (in dollars per share) 39.67 $ 52.90
Weighted Average Exercise Price, Exercisable December 31, 2017 (in dollars per share) $ 42.71  
Weighted Average Remaining Life In Years, Outstanding, December 31, 2017 (Years) 6 years 3 months 18 days  
Weighted Average Remaining Life In Years, Exercisable, Exercisable, December 31, 2017 (Years) 5 years 7 months 6 days  
Intrinsic Value, Outstanding, December 31, 2017 $ 0  
Intrinsic Value, Exercisable, December 31, 2017 $ 0