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8. Stock Options and Warrants (Tables)

12 Months Ended

Dec. 31, 2018

Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]

Stock option activity

		Options				Weighted Avg. Exercise Price
Options outstanding, January 1, 2017			23,474,256			$	0.30
Options granted			12,561,852				0.12
Options exercised			(449,754	)			0.05
Options cancelled			(188,679	)			0.53
Options outstanding, December 31, 2017			35,397,675			$	0.23
Options granted			2,083,335				0.18
Options exercised			(179,710	)			0.07
Options cancelled			(2,000,000	)			0.28
Options outstanding, December 31, 2018			35,301,300				0.22

Options outstanding by Per Share Price

				Outstanding Options													Exercisable Options
	Option Exercise Price Per Share				Shares				Life (Years)				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
	$ 0.05 - $ 0.24				13,766,250				8.1			$	0.10				13,466,250			$	0.10
	$ 0.25 - $ 0.49				20,913,552				3.3				0.27				18,913,552				0.27
	$ 0.50 - $ 0.99				471,052				5.3				0.85				471,052				0.85
	$ 1.00 - $ 2.00				150,446				4.6				1.18				150,446				1.18
					35,301,300				5.2			$	0.22				33,001,300			$	0.21

Assumptions used for option valuation

		Years Ended
		2018				2017
Expected life (years)			5.5				5 – 6
Risk free interest rate			1.70%				1.72 – 1.94%
Volatility			118%				114 – 124%
Expected dividend yield			0%				0%

Warrant activity

		Warrants				Weighted Avg. Exercise Price
Warrants outstanding, January 1, 2017			11,446,892				0.15
Warrants granted			16,160,770				0.05
Warrants exercised			(4,414,000	)			0.08
Warrants cancelled			(5,571,225	)			0.10
Warrants outstanding, December 31, 2017			17,622,437			$	0.09
Warrants granted			18,238,688				0.05
Warrants exercised			(12,517,773	)			0.05
Warrants cancelled			(2,287,997	)			0.05
Warrants outstanding, December 31, 2018			21,055,355				0.09

Warrants outstanding by Per Share Price

					Outstanding Warrants												Exercisable Warrants
	Warrant Exercise Price Per Share				Shares				Life (Years)				Weighted Average Exercise Price				Shares				Weighted Average Exercise Price
	$ 0.05 - $ 0.24				18,343,688				0.9			$	0.06				18,343,688			$	0.06
	$ 0.25 - $ 0.49				2,641,667				2.2				0.30				2,641,667				0.30
	$ 0.50 - $ 1.00				70,000				5.3				0.80				70,000				0.80
					21,055,355				1.1			$	0.09				21,055,355			$	0.09

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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