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Earnings Per Share - Computation of Basic and Diluted Net Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net income (loss)	$ 5,595	$ 1,960	$ 8,069	$ (16,552)
Denominator:
Basic weighted average shares outstanding	25,691,357	25,634,417	25,683,969	17,743,703
Dilutive effect of share option awards	281,244
Dilutive effect of restricted share units and restricted share awards	374,072		183,195
Diluted weighted average shares outstanding	26,346,673	25,634,417	25,867,164	17,743,703
Net earnings (loss) per share, basic	$ 0.22	$ 0.08	$ 0.31	$ (0.93)
Net earnings (loss) per share, diluted	$ 0.21	$ 0.08	$ 0.31	$ (0.93)

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