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Stock Options (Details) - Employee Stock Option [Member]
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Options, Outstanding at January 1, 2018 (in shares) | shares 4,241,799
Number of Options, Granted (in shares) | shares 1,997,500
Number of Options, Exercised (in shares) | shares 0
Number of Options, Forfeited/Expired (in shares) | shares (775,413)
Number of Options, Outstanding at September 30, 2018 (in shares) | shares 5,463,886
Number of Options Exercisable at September 30, 2018 (in shares) | shares 3,427,231
Number of Options, Vested and Expected to Vest at September 30, 2018 (in shares) | shares 5,463,886
Weighted Average Exercise Price Outstanding at January 1, 2018 (in dollars per shares) | $ / shares $ 2.82
Weighted Average Exercise Price Granted (in dollars per shares) | $ / shares 1.09
Weighted Average Exercise Price Exercised (in dollars per shares) | $ / shares 0
Weighted Average Exercise Price Forfeited/Expired (in dollars per shares) | $ / shares 2.66
Weighted Average Exercise Price Outstanding at September 30, 2018 (in dollars per shares) | $ / shares 2.21
Weighted Average Exercise Price Exercisable at September 30, 2018 (in dollars per shares) | $ / shares 2.75
Weighted Average Exercise Price Vested and Expected to Vest at September 30, 2018 (in dollars per shares) | $ / shares $ 2.21
Weighted Average Remaining Contractual Term Outstanding at September 30, 2018 (in years) 5 years 9 months 18 days
Weighted Average Remaining Contractual Term Exercisable at September 30, 2018 (in years) 4 years 11 months 26 days
Weighted Average Remaining Contractual Term Vested and Expected to Vest at September 30, 2018 (in years) 5 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding at September 30, 2018 | $ $ 751,100
Aggregate Intrinsic Value, Exercisable at September 30, 2018 | $ 108,320
Aggregate Intrinsic Value, Vested and Expected to Vest at September 30, 2018 | $ $ 751,100