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Warrants (Tables)
12 Months Ended
Dec. 31, 2017
Warrants [Abstract]  
Schedule of warrants, valuation assumptions
Exercise price $1,250 
Expected life  7 years 
Expected volatility  38%
Dividend yield  0%
Risk-free interest rate  1.35%
Summary of outstanding stock warrants
Exercise  Common Stock
Warrants
  Series 2 Preferred
Stock Warrants
  Weighted Average Remaining
Price  Outstanding  Outstanding  Contractual Life
          
$11.00   134,250      1 years
$10.00   200,000      3 years
$5.50   177,303      4 years
$1,250   -   439  6 years
     511,553   439