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Stock Options - Summary of Options Outstanding by Price Range (Details) - Stock Option Plan [Member]
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Options Outstanding, Exercise Price Lower Limit $ 0.25
Options Outstanding, Exercise Price Upper Limit $ 0.70
Options Outstanding, Number Outstanding | shares 8,666,667
Options Outstanding, Remaining Average Contractual Life (Years) 7 years 2 months 16 days
Options Outstanding, Weighted Average Exercise Price $ 0.51
Options Exercisable, Number Exercisable | shares 5,941,667
Options Exercisable, Weighted Average Exercise Price $ 0.46