Quarterly report pursuant to Section 13 or 15(d)

Equity Incentive Plan (Details)

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Equity Incentive Plan (Details) - Equity Incentive Plan 2014 [Member] - $ / shares
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Options, Outstanding beginning of year 1,893,003 1,509,711 1,509,711  
Number of Options, Granted 275,500 51,450    
Number of Options, Exercised   (1,083)    
Number of Options, Expired/Forfeited (1,500) (70,144)    
Number of Options, Outstanding at end of period 2,167,003 1,489,934 1,893,003 1,509,711
Number of Options, Exercisable at end of period 1,272,677 1,051,719    
Number of Options, Vested and expected to vest at end of period 1,272,677 1,051,719    
Weighted- Average Exercise Price, Outstanding at beginning of year $ 2.49 $ 2.85 $ 2.85  
Weighted- Average Exercise Price, Granted 0.57 1.71    
Weighted- Average Exercise Price, Exercised 0.83 1.70    
Weighted- Average Exercise Price, Expired   2.16    
Weighted- Average Exercise Price, Outstanding at end of period 2.24 2.87 $ 2.49 $ 2.85
Weighted- Average Exercise Price, Exercisable at end of period 2.72 2.75    
Weighted- Average Exercise Price, Vested and expected to vest at end of period $ 2.72 $ 2.75    
Weighted-Average Contractual Life (In Years), Outstanding 5 years 5 months 26 days 5 years 3 months 7 days 5 years 4 months 24 days 5 years 14 days
Weighted-Average Contractual Life (In Years), Granted 9 years 10 months 24 days 9 years 10 months 6 days    
Weighted-Average Contractual Life (In Years), Exercisable at end of period 3 years 10 months 24 days 4 years 5 months 26 days    
Weighted-Average Contractual Life (In Years), Vested and expected to vest at end of period 3 years 10 months 24 days 4 years 5 months 26 days