Activity Under Equity Incentive Plans Related to RSUs (Detail) - 2008 Equity Incentive Plan - Restricted Stock Units shares in Thousands	12 Months Ended
	Dec. 31, 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	7,729	[1]
Vested, Number of Restricted Stock Units Unvested | shares	(4,029)	[1]
Forfeited, Number of Restricted Stock Units Unvested | shares	(725)	[1]
Number of Restricted Stock Units Unvested, Ending Balance | shares	13,661
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	2.14	[1]
Vested, Weighted Average Exercise Price per Share | $ / shares	4.22	[1]
Forfeited, Weighted Average Exercise Price per Share | $ / shares	3.02	[1]
Weighted Average Exercise Price per Share, Ending Balance | $ / shares	$ 2.73

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