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Stockholders' Equity - Summary of Outstanding Stock Options Issued to Employees and Directors (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Number of Options, Cancelled (1,387,333)  
Employees and Directors [Member]    
Number of Options, Outstanding, Beginning 7,428,014 6,715,419
Number of Options, Issued 1,156,343 1,542,111
Number of Options, Cancelled (1,387,333) (321,183)
Number of Options, Exercised (508,333)
Number of Options, Outstanding, Ending 7,197,024 7,428,014
Number of Options, Exercisable 3,706,606  
Average remaining term in years, Outstanding, Beginning 5 years 5 months 23 days 5 years 5 months 23 days
Average remaining term in years, Outstanding, Ending 4 years 6 months 18 days 5 years 5 months 23 days
Average remaining term in years, Exercisable 3 years 5 months 12 days  
Aggregate intrinsic value at date of grant, Outstanding, Beginning  
Aggregate intrinsic value at date of grant, Exercisable  
Employees and Directors [Member] | Minimum [Member]    
Exercise price per share, Outstanding, Beginning $ 0.40 $ 0.40
Exercise price per share, Issued 0.45 0.50
Exercise price per share, Outstanding, Ending 0.40 0.40
Exercise price per share, Exercisable 0.40  
Employees and Directors [Member] | Maximum [Member]    
Exercise price per share, Outstanding, Beginning 0.87 0.87
Exercise price per share, Issued 0.73 0.60
Exercise price per share, Outstanding, Ending 0.87 $ 0.87
Exercise price per share, Exercisable $ 0.87