Activity Under Equity Incentive Plans Related to RSUs (Detail) - 2008 Equity Incentive Plan - Restricted Stock Units shares in Thousands	9 Months Ended
	Sep. 30, 2024 $ / shares shares
Activity under the Company's equity incentive plans related to restricted stock units
Number of Restricted Stock Units Unvested, Beginning Balance | shares	10,686
Granted, Number of Restricted Stock Units Unvested | shares	7,557	[1]
Vested, Number of Restricted Stock Units Unvested | shares	(3,889)	[1]
Forfeited, Number of Restricted Stock Units Unvested | shares	(648)	[1]
Number of Restricted Stock Units Unvested, Ending Balance | shares	13,706
Weighted Average Exercise Price per Share
Weighted Average Exercise Price per Share, Beginning Balance | $ / shares	$ 3.74
Granted, Weighted Average Exercise Price per Share | $ / shares	2.15	[1]
Vested, Weighted Average Exercise Price per Share | $ / shares	4.26	[1]
Forfeited, Weighted Average Exercise Price per Share | $ / shares	3.09	[1]
Weighted Average Exercise Price per Share, Ending Balance | $ / shares	$ 2.74

[1] Includes shares issuable under performance-based restricted stock unit awards.