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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 49,798	$ 33,004	$ (155,945)	$ (130,657)
Weighted average number of common shares used to calculate net income (loss) per share:
Basic	92,644	90,558	92,206	89,414
Dilutive effect of potential common shares	164	3,120	0	0
Diluted	92,808	93,678	92,206	89,414
Net income (loss) per share:
Basic	$ 0.54	$ 0.36	$ (1.69)	$ (1.46)
Diluted	$ 0.54	$ 0.35	$ (1.69)	$ (1.46)

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