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Equity - Summary of Stock Option Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Number of Options, Outstanding at beginning balance	1,401,489	2,050,369
Number of Options, Granted at market price	175,000	91,500
Number of Options, Exercised
Number of Options, Forfeited or expired	(110,000)	(740,380)
Number of Options, Outstanding at end balance	1,466,489	1,401,489
Number of Options, Exercisable at end of period	1,386,489	1,393,155
Weighted Average Exercise Price, Outstanding at beginning balance	$ 3.45	$ 3.62
Weighted Average Exercise Price, Granted at market price	0.32	0.25
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited or expired	4.32	3.54
Weighted Average Exercise Price, Outstanding at end balance	3.01	3.45
Weighted Average Exercise Price, Exercisable at end of period	$ 3.16	$ 3.47

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

+ References

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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Number of share options (or share units) exercised during the current period.

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