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Stockholders' Equity - Summary of Outstanding Stock Options Issued to Employees and Directors (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
$ / shares
shares
Number of Options, Cancelled/Expired | shares (30,000)
Exercise price per share, Outstanding, Ending $ 0.37
Employees and Directors [Member]  
Number of Options, Outstanding, Beginning | shares 7,197,024
Number of Options, Issued | shares 646,899
Number of Options, Cancelled/Expired | shares (488,667)
Number of Options, Outstanding, Ending | shares 7,355,256
Number of Options, Exercisable | shares 3,831,550
Average remaining term in years, Outstanding, Beginning 4 years 6 months 18 days
Average remaining term in years, Outstanding, Issued 7 years 9 months 7 days
Average remaining term in years, Outstanding, Ending 4 years 4 months 17 days
Average remaining term in years, Exercisable 3 years 3 months 26 days
Aggregate intrinsic value at date of grant, Outstanding, Beginning | $
Aggregate intrinsic value at date of grant, Issued | $
Aggregate intrinsic value at date of grant, Outstanding, Ending | $
Aggregate intrinsic value at date of grant, Exercisable | $
Employees and Directors [Member] | Minimum [Member]  
Exercise price per share, Outstanding, Beginning $ 0.40
Exercise price per share, Outstanding, Ending 0.37
Exercise price per share, Exercisable 0.40
Employees and Directors [Member] | Maximum [Member]  
Exercise price per share, Outstanding, Beginning 0.87
Exercise price per share, Issued 0.37
Exercise price per share, Outstanding, Ending 0.87
Exercise price per share, Exercisable $ 0.87