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Stock options (Details) - $ / shares	1 Months Ended	12 Months Ended
	Jul. 25, 2017	Dec. 31, 2018	Dec. 31, 2017
Options
Outstanding at beginning		1,154,167	1,154,167
Granted	56,000	0
Expired		1,150,000
Cancelled or Exercised
Outstanding at ending		4,167	1,154,167
Weighted-Average Exercise Price
Weighted average exercise price beginning		$ 0.21	$ 0.21
Granted	$ 4.5
Expired		0.21
Weighted average exercise price ending		$ 3.12	$ 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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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