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Warrants (Tables)
12 Months Ended
Dec. 31, 2017
Warrants [Abstract]  
Schedule of warrants outstanding
Number of Shares Underlying Warrants Exercise Price Expiration Date
804,139 $1.20 03/17/2019
240,444 $0.7875 09/24/2020
Schedule of warrant activity
  Number of Shares Underlying Warrants  Weighted average exercise price 
Outstanding, January 1, 2016  2,094,583  $1.65 
Granted  -   - 
Expired  (50,000) $0.89 
Balance, December 31, 2016  2,044,583  $1.67 
Granted  -   - 
Expired  (1,000,000) $2.25 
Balance, December 31, 2017  1,044,583  $1.11