Diluted loss per share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Net loss	$ (19,619)	$ (24,462)
Less: recovery of fair value of liability classified awards	(433)	0
Diluted loss available to common shareholders	$ (20,052)	$ (24,462)
Weighted average number of common shares for basic loss per share	25,255,413	18,198,840
Plus: incremental shares from assumed exercise	62,783	0
Diluted weighted average number of common shares for diluted loss per share	25,318,196	18,198,840
Loss per share - diluted	$ (0.79)	$ (1.34)

The amount of Recovery of fair value of liability classified awards.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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