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Stock options (Details) - $ / shares	1 Months Ended		12 Months Ended
	Dec. 31, 2017	Jul. 25, 2017	Dec. 31, 2017	Dec. 31, 2016
Options
Outstanding at beginning			1,154,167	6,250
Granted	1,225,000	56,000	0	600,000
Granted			0	550,000
Cancelled or Exercised			0	2,083
Outstanding at ending	1,154,167		1,154,167	1,154,167
Weighted-Average Exercise Price
Weighted average exercise price beginning			$ 0.21	$ 2.56
Granted				0.15
Granted				0.25
Cancelled or Exercised				1.44
Weighted average exercise price ending	$ 0.21		$ 0.21	$ 0.21

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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 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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