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Significant Accounting Policies - Calculation of Net Income (Loss) and Number of Shares Used to Compute Basic and Diluted Net Earnings (Loss) per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Loss Per Share [Line Items]
Net income (loss)—basic and diluted	$ 4,415	$ (1,820)	$ (16,138)	$ (26,251)
Weighted average shares outstanding—basic	384,663	330,863	373,300	329,793
Effect of dilutive securities:
Preferred stock, if converted	6,989
Weighted average shares outstanding—diluted	399,664	330,863	373,300	329,793
Net income (loss) per share—basic	$ 0.01	$ (0.01)	$ (0.04)	$ (0.08)
Net income (loss) per share—diluted	$ 0.01	$ (0.01)	$ (0.04)	$ (0.08)
Stock Options
Effect of dilutive securities:
Effect of dilutive securities	6,372
Restricted Stock Units (RSUs)
Effect of dilutive securities:
Effect of dilutive securities	1,640

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