Financial Statement Details - Interest and Investment Income, Net (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financial Statement Details [Abstract]
Interest income	$ 610	$ 253	$ 1,486	$ 2,193
Unrealized (losses) gains from equity securities	(593)	614	(851)	162
Investment amortization expense, net	0	(10)	0	(1,513)
Net realized gains (losses) on investments	18	0	12	(119)
Interest and investment income, net	$ 35	$ 857	$ 647	$ 723