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Stock options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Options
Outstanding at beginning	4,167	1,154,167
Granted	5,000,000
Expired
Cancelled or Exercised		1,150,000
Outstanding at ending	5,004,167	4,167
Weighted-Average Exercise Price
Weighted average exercise price beginning	$ 3.12	$ 0.21
Cancelled or Exercised	0.33	0.21
Weighted average exercise price ending	$ 0.33	$ 3.12

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Net 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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