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Shareholders Equity and Capital Stock (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shareholders' Equity and Capital Stock
Outstanding, Beginning Balance	11,076,583	9,731,612	9,459,401
Granted, Options	2,950,180	2,852,386	2,182,955
Exercised, options	(159,982)	(323,618)	(496,838)
Forfeited, Options	(534,425)	(395,851)	(275,085)
Expired, Options	(1,421,932)	(787,946)	(1,138,821)
Outstanding Ending Balance, Options	11,910,424	11,076,583	9,731,612
Outstanding, Beginning Balance, Weighted-average exercise price	$ 0.64	$ 0.64	$ 0.70
Granted, Weighted-average exercise price	0.48	0.61	0.70
Exercised, Weighted-average exercise price	0.63	0.63	0.58
Forfeited, Weighted-average exercise price	0.64	0.71	0.72
Expired, Weighted-average exercise price	0.66	0.83	0.83
Outstanding Ending Balance, Weighted-average exercise price	$ 0.61	$ 0.64	$ 0.64

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Number of non-option equity instruments exercised by participants.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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-Topic 718
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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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