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Stock options (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Options
Outstanding at Beginning	6,250	6,250
Granted	600,000	0
Granted	550,000
Cancelled or Exercised	2,083	0
Outstanding at End	1,154,167	6,250
Weighted-Average Exercise Price
Weighted-Average Exercise Price	$ 2.56	$ 2.56
Granted	0.15
Granted	0.25
Cancelled or Exercised	1.44	0
Weighted-Average Exercise Price	$ 0.21	$ 2.56

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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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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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