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Employee Stock Option Plans - Grant Date Fair Value 2013 Plan (Details) - $ / shares | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 01, 2017 | Jul. 12, 2017 | Jul. 28, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Option – grant date price |  | $ .77 | $ 1.35 | $ .72
Options granted |  | 200,000 | 1,782,428 | 1,699,000
Expected life years | 5 years |  |  |
Expected volatility | 65.00% |  |  |
Risk free interest rate |  | 1.70% | 1.00% | 0.90%
Weighted average fair value |  | $ 0.42 | $ 0.15 | $ 0.5
Grant date fair value |  | $ 126 | $ 41 | $ 850

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