Earnings Per Share - Computation of Basic and Diluted Net Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 2,322	$ 11,517	$ 754	$ 31,377
Denominator:
Basic weighted average shares outstanding	26,836,853	26,365,207	26,793,505	26,241,101
Dilutive effect of share option awards	560,263	2,113,603	892,072	2,058,633
Dilutive effect of restricted share units and restricted share awards	187,826	408,068	223,752	412,428
Dilutive effect of employee share purchase plan	3,830	22,470	8,399	18,063
Diluted weighted average shares outstanding	27,588,772	28,909,348	27,917,728	28,730,225
Net earnings per share, basic	$ 0.09	$ 0.44	$ 0.03	$ 1.20
Net earnings per share, diluted	$ 0.08	$ 0.40	$ 0.03	$ 1.09