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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule of fair value of derivative liabilities using Black-Scholes option-pricing model
    2018    2017 
           
Expected volatility   191% - 196%   125% - 214%
Risk free interest rate   2.44% - 2.58%   1.31% - 2.57%
Expected dividend yield   -    - 
Expected warrant term (in years)   3.0 - 5.0    0.9 - 8.1 
Weighted average grant date fair value  $0.21 – 0.22   $0.12 - 0.45 
Employee Stock Option [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of outstanding service-based options
Number of  Options 
Balance at December 31, 2016   10,700,273 
Issued   1,600,000 
Exercised   -1,339,473 
      
Balance at December 31, 2017   10,960,800 
Issued   3,400,000 
Expired   -550,000 
Exercised   -40,800 
Balance at December 31, 2018   13,820,000 
Summary of significant assumptions used to determine fair values of options issued using Black-Scholes option-pricing model
Significant assumptions:    
Risk-free interest rate at grant date   0.65% - 2.84 %
Expected stock price volatility   96.56 %-180.45 %
Expected dividend payout   - 
Expected option life-years   3 years 
Weighted average grant date fair value  $0.02 - 0.32 
Forfeiture rate   0.01%
Summary of outstanding service-based options exercise price
Exercise Price   Number of   Weighted Average 
Options   Remaining Contractual Life
$ 0.20 - $0.25   8,120,000   3.8 years
$ 0.30 - $0.35   3,825,000   8.7 years
$ 0.4   1,875,000   5.0 years
  Total   13,820,000    
Warrant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of outstanding service-based options
   Number of   Weighted Average Exercise   Year of 
   Shares   Price   Expiration 
             
Balance at December 31, 2016   1,954,981   $0.19    2017 - 2019 
Issued   2,634,228    0.40    2018 - 2020 
Exercised   -1,500,000    0.12    2017 
                
Balance at December 31, 2017   3,089,119    0.40    2018 - 2020 
Expired   -354,891    0.44    2018 
Issued   2,491,305    0.29    2023 - 2028 
Exercised   -           
Balance at December 31, 2018   5,225,533   $0.35    2019 - 2028