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Stock Options - Summary of Options Outstanding by Price Range (Details)
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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) 6 years 8 months 19 days
Options Outstanding, Weighted Average Exercise Price $ 0.51
Options Exercisable, Number Exercisable | shares 6,458,334
Options Exercisable, Weighted Average Exercise Price $ 0.47