Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 2)

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Stockholders' Equity (Details 2) - Warrant [Member] - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Warrants, Outstanding Beginning Balance 4,326,555  
Number of Warrants, Exercised (15,667)  
Number of Warrants, Outstanding Ending Balance 4,310,888 4,326,555
Nonvested at December 31, 2017 $ 6.62  
Weighted Average Grant Date Fair Value, Vested 0  
Nonvested at September 30, 2018 $ 6.65 $ 6.62
Weighted Average Remaining Contractual Life, Outstanding (in years) 2 years 7 months 10 days 3 years 8 months 1 day