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
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding beginning of year 1,893,003  
Number of Options, Granted 275,500  
Number of Options, Forfeited (1,500)  
Number of Options, Expired (60,968)  
Number of Options, Outstanding at end of period 2,106,035 1,893,003
Number of Options, Exercisable at end of period 1,429,484  
Number of Options, Vested and expected to vest at end of period 1,429,484  
Weighted- Average Exercise Price, Outstanding at beginning of year $ 2.49  
Weighted- Average Exercise Price, Granted 0.57  
Weighted- Average Exercise Price, Forfeited 0.83  
Weighted- Average Exercise Price, Expired 0.80  
Weighted- Average Exercise Price, Outstanding at end of period 2.29 $ 2.49
Weighted- Average Exercise Price, Exercisable at end of period 2.65  
Weighted- Average Exercise Price, Vested and expected to vest at end of period $ 2.65  
Weighted-Average Contractual Life (In Years), Outstanding 4 years 7 months 28 days 5 years 4 months 24 days
Weighted-Average Contractual Life (In Years), Granted 9 years 7 months 24 days  
Weighted-Average Contractual Life (In Years), Exercisable at end of period 3 years 11 months 12 days  
Weighted-Average Contractual Life (In Years), Vested and expected to vest at end of period 3 years 11 months 12 days