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Stock Options - Summary of Stock Option Activity (Details) - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2019 (in shares) | shares 4,982,040
Number of Options, Granted (in shares) | shares 2,112,500
Number of Options, Forfeited/Expired (in shares) | shares (214,237)
Number of Options, Outstanding at September 30, 2019 (in shares) | shares 6,880,303
Number of Options Exercisable at September 30, 2019 (in shares) | shares 4,067,655
Number of Options, Vested and Expected to Vest at September 30, 2019 (in shares) | shares 6,880,303
Weighted Average Exercise Price Outstanding at January 1, 2019 (in dollars per shares) | $ / shares $ 2.14
Weighted Average Exercise Price Granted (in dollars per shares) | $ / shares 1.25
Weighted Average Exercise Price Forfeited/Expired (in dollars per shares) | $ / shares 2.46
Weighted Average Exercise Price Outstanding at September 30, 2019 (in dollars per shares) | $ / shares 1.86
Weighted Average Exercise Price Exercisable at September 30, 2019 (in dollars per shares) | $ / shares 2.31
Weighted Average Exercise Price Vested and Expected to Vest at September 30, 2019 (in dollars per shares) | $ / shares $ 1.86
Weighted Average Remaining Contractual Term Outstanding at September 30, 2019 (in years) 7 years 1 month 10 days
Weighted Average Remaining Contractual Term Exercisable at September 30, 2019 (in years) 5 years 6 months 11 days
Weighted Average Remaining Contractual Term Vested and Expected to Vest at September 30, 2019 (in years) 7 years 1 month 10 days
Aggregate Intrinsic Value, Outstanding at September 30, 2019 | $ $ 591,955
Aggregate Intrinsic Value, Exercisable at September 30, 2019 | $ 234,016
Aggregate Intrinsic Value, Vested and Expected to Vest at September 30, 2019 | $ $ 591,955