Fair Values on Financial Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Fair value of financial assets and liabilities
Total short-term investments	$ 42,645	$ 64,728
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 4,361	$ 1,810
United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 17,520	$ 23,479
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 18,317	$ 36,822
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 2,447	$ 2,617
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 1
Fair value of financial assets and liabilities
Total short-term investments	$ 4,361	$ 1,810
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 1 \| Money market funds
Fair value of financial assets and liabilities
Total short-term investments	$ 4,361	$ 1,810
Level 2
Fair value of financial assets and liabilities
Total short-term investments	$ 38,284	$ 62,918
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 \| United States government agency securities
Fair value of financial assets and liabilities
Total short-term investments	$ 17,520	$ 23,479
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 \| Corporate debt securities
Fair value of financial assets and liabilities
Total short-term investments	$ 18,317	$ 36,822
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]
Level 2 \| Mortgage-backed securities
Fair value of financial assets and liabilities
Total short-term investments	$ 2,447	$ 2,617
Investment, Type [Extensible Enumeration]	Short-Term Investments [Member]	Short-Term Investments [Member]

Indicates type of investment. Includes, but is not limited to, common stock, preferred stock, convertible security, fixed income security, government security, option purchased, warrant, loan participation and assignment, commercial paper, bankers' acceptance, certificates of deposit, short-term security, repurchase agreement, and other investment company.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478795/946-210-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column A)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column A)(Footnote 2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12(Column C)(Footnote 5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column A)(Footnote 1)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column C)(Footnote 2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 6
-Subparagraph (SX 210.12-14(Column F)(Footnote 7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 320
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.12-12A(Column C)(Footnote 4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2

+ Details

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details