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Stock Options - Summary of Stock Option Activity (Details) - Employee Stock Option [Member]
 6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2020 (in shares) | shares 6,833,303
Number of Options, Granted (in shares) | shares 1,050,000
Number of Options, Forfeited/Expired (in shares) | shares (634,303)
Number of Options, Outstanding at March 31, 2020 (in shares) | shares 7,249,000
Number of Options Exercisable at March 31, 2020 (in shares) | shares 4,576,417
Number of Options, Vested and Expected to Vest at March 31, 2020 (in shares) | shares 7,249,000
Weighted Average Exercise Price Outstanding at January 1, 2020 (in dollars per shares) | $ / shares $ 1.86
Weighted Average Exercise Price Granted (in dollars per shares) | $ / shares 1.37
Weighted Average Exercise Price Forfeited/Expired (in dollars per shares) | $ / shares 3.08
Weighted Average Exercise Price Outstanding at March 31, 2020 (in dollars per shares) | $ / shares 1.68
Weighted Average Exercise Price Exercisable at March 31, 2020 (in dollars per shares) | $ / shares 1.93
Weighted Average Exercise Price Vested and Expected to Vest at March 31, 2020 (in dollars per shares) | $ / shares $ 1.68
Weighted Average Remaining Contractual Term Outstanding at March 31, 2020 (in years) 7 years 4 months 6 days
Weighted Average Remaining Contractual Term Exercisable at March 31, 2020 (in years) 6 years 3 months 29 days
Weighted Average Remaining Contractual Term Vested and Expected to Vest at March 31, 2020 (in years) 7 years 4 months 6 days
Aggregate Intrinsic Value, Outstanding at March 31, 2020 | $ $ 693,862
Aggregate Intrinsic Value, Exercisable at March 31, 2020 | $ 392,225
Aggregate Intrinsic Value, Vested and Expected to Vest at March 31, 2020 | $ $ 693,862