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Stockholders' Equity - Summary of Outstanding Stock Options Issued to Employees and Directors (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
$ / shares
shares
Number of Options, Outstanding, Beginning | shares 7,640,959
Number of Options, Issued | shares 250,000
Number of Options, Cancelled/Expired | shares (450,000)
Number of Options, Outstanding, Ending | shares 7,440,959
Number of Options, Exercisable | shares 6,227,627
Average remaining term in years, Outstanding, Beginning 3 years 5 months 23 days
Average remaining term in years, Outstanding, Issued 7 years 9 months 29 days
Average remaining term in years, Outstanding, Ending 3 years 8 months 12 days
Average remaining term in years, Exercisable 3 years 4 months 24 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 | $
Minimum [Member]  
Exercise price per share, Outstanding, Beginning $ 0.34
Exercise price per share, Issued 0.38
Exercise price per share, Outstanding, Ending 0.34
Exercise price per share, Exercisable 0.34
Maximum [Member]  
Exercise price per share, Outstanding, Beginning 0.87
Exercise price per share, Issued 0.42
Exercise price per share, Outstanding, Ending 0.87
Exercise price per share, Exercisable $ 0.87