Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plan (Details)

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Equity Incentive Plan (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity Incentive Plan      
Number of Options, Outstanding at beginning of year 138,324 127,310  
Number of Options, Granted 49,994 27,687  
Number of Options, Expired (9,274) (10,526)  
Number of Options, Forfeited (4,869) (6,147)  
Number of Options, Outstanding at end of year 174,175 138,324 127,310
Number of Options, Exercisable at end of year 117,534    
Number of Options, Vested and expected to vest at end of year 174,175    
Weighted- Average Exercise Price, Outstanding at beginning of year $ 34.17 $ 38.14  
Weighted- Average Exercise Price, Granted 7.20 8.55  
Weighted- Average Exercise Price, Expired 28.58 25.76  
Weighted- Average Exercise Price, Forfeited 9.19 15.44  
Weighted- Average Exercise Price, Outstanding at end of year 27.42 $ 34.17 $ 38.14
Weighted- Average Exercise Price, Exercisable at end of year 36.78    
Weighted- Average Exercise Price, Vested and expected to vest at end of year $ 27.42    
Weighted-Average Contractual Life (In Years), Outstanding 6 years 2 months 19 days 5 years 11 months 12 days 5 years 9 months 29 days
Weighted-Average Contractual Life (In Years), Exercisable at end of year 5 years 2 months 5 days    
Weighted-Average Contractual Life (In Years), Vested and expected to vest at end of year 6 years 2 months 19 days