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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ (49,439)	$ (42,556)	$ 21,153	$ (107,373)
Weighted average number of common shares used to calculate net income (loss) per share:
Basic	87,007	84,508	86,390	83,713
Dilutive effect of potential common shares	0	0	5,605	0
Diluted	87,007	84,508	91,995	83,713
Net income (loss) per share:
Basic	$ (0.57)	$ (0.50)	$ 0.24	$ (1.28)
Diluted	$ (0.57)	$ (0.50)	$ 0.23	$ (1.28)

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