Stock-based Compensation Expense - Schedule of Company's Restricted Stock Units and Unregistered Restricted Stock Awards Activity (Detail) shares in Thousands	9 Months Ended
	Sep. 30, 2023 $ / shares shares
RSUs outstanding
Number of Shares
Beginning balance (in shares) | shares	30,322
Granted (in shares) | shares	18,876
Vested and released (in shares) | shares	(10,231)
Cancelled (in shares) | shares	(2,087)
Ending balance (in shares) | shares	36,880
Weighted-Average Grant Date Fair Value (per Share)
Beginning balance (in dollars per share) | $ / shares	$ 48.73
Granted (in dollars per share) | $ / shares	39.48
Released (in dollars per share) | $ / shares	46.90
Cancelled (in dollars per share) | $ / shares	49.00
Ending balance (in dollars per share) | $ / shares	$ 44.48
RSAs
Number of Shares
Beginning balance (in shares) | shares	500
Granted (in shares) | shares	0
Vested and released (in shares) | shares	(224)
Cancelled (in shares) | shares	0
Ending balance (in shares) | shares	276
Weighted-Average Grant Date Fair Value (per Share)
Beginning balance (in dollars per share) | $ / shares	$ 52.55
Granted (in dollars per share) | $ / shares	0
Released (in dollars per share) | $ / shares	50.74
Cancelled (in dollars per share) | $ / shares	0
Ending balance (in dollars per share) | $ / shares	$ 54.18