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Stock Options - Summary of Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Options, Outstanding at January 1, (in shares) 6,828,303 4,982,040
Number of Options, Granted (in shares) 1,080,000 2,112,500
Number of Options, Exercised (in shares) (1,357,116) (10,000)
Number of Options, Forfeited/Expired (in shares) (644,303) (256,237)
Number of Options, Outstanding at December 31, (in shares) 5,906,884 6,828,303
Number of Options Exercisable at December 31, 2020 (in shares) 3,923,564  
Number of Options, Vested and Expected to Vest at December 31, 2020 (in shares) 5,906,884  
Weighted Average Exercise Price Outstanding (in dollars per shares) $ 1.86 $ 2.14
Weighted Average Exercise Price Granted (in dollars per shares) 1.37 1.25
Weighted Average Exercise Price Exercised (in dollars per shares) 1.97 1.11
Weighted Average Exercise Price Forfeited/Expired (in dollars per shares) 3.06 2.42
Weighted Average Exercise Price Outstanding (in dollars per shares) 1.61 $ 1.86
Weighted Average Exercise Price Exercisable at December 31, 2020 (in dollars per shares) 1.79  
Weighted Average Exercise Price Vested and Expected to Vest at December 31, 2020 (in dollars per shares) $ 1.61  
Weighted Average Remaining Contractual Term Outstanding (in years) 7 years 4 months 2 days 6 years 10 months 10 days
Weighted Average Remaining Contractual Term Exercisable at December 31, 2020 (in years) 6 years 7 months 28 days  
Weighted Average Remaining Contractual Term Vested and Expected to Vest at December 31, 2020 (in years) 7 years 4 months 2 days  
Aggregate Intrinsic Value, Outstanding at December 31, $ 21,769,727 $ 89,405
Aggregate Intrinsic Value, Exercisable at December 31, 2020 13,769,733  
Aggregate Intrinsic Value, Vested and Expected to Vest at December 31, 2020 $ 21,769,727