Financial Instruments - Available-for-Sale Marketable Debt Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 11,076	$ 970
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(85)	(94)
Fair Value	10,994	876
Current Assets
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	10,176
Gross Unrealized Gains	3
Gross Unrealized Losses	(2)
Fair Value	$ 10,177
Current Assets | U.S. Treasury securities
Schedule Of Available For Sale Securities [Line Items]
Weighted- Average Remaining Contractual Life (in years)	2 months 12 days
Amortized Cost	$ 9,980
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Value	$ 9,981
Current Assets | Foreign bonds
Schedule Of Available For Sale Securities [Line Items]
Weighted- Average Remaining Contractual Life (in years)	3 months 18 days
Amortized Cost	$ 156
Gross Unrealized Gains	2
Gross Unrealized Losses	0
Fair Value	158
Current Assets | Mutual funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	40	38
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(2)	(2)
Fair Value	$ 38	$ 36
Noncurrent Assets | Foreign bonds
Schedule Of Available For Sale Securities [Line Items]
Weighted- Average Remaining Contractual Life (in years)	3 years 9 months 18 days	4 years 6 months
Amortized Cost	$ 900	$ 932
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(83)	(92)
Fair Value	$ 817	$ 840