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Significant Accounting Policies - Summary of Reconciliation of Basic and Diluted Net Income (Loss) Per Share Calculation (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 33,004	$ (49,439)	$ (130,657)	$ 21,153
Weighted average number of common shares used to calculate net income (loss) per share:
Basic	90,558	87,007	89,414	86,390
Dilutive effect of potential common shares	3,120	0	0	5,605
Diluted	93,678	87,007	89,414	91,995
Net income (loss) per share:
Basic	$ 0.36	$ (0.57)	$ (1.46)	$ 0.24
Diluted	$ 0.35	$ (0.57)	$ (1.46)	$ 0.23

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