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Financial Instruments - Fair Value Measured On A Recurring Basis (Detail) - USD ($) | Sep. 30, 2023 | Dec. 31, 2022
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | $ 44,792,000 | $ 57,534,000
Long-term investments | 18,137,000 | 41,978,000
Assets measured at fair value | 313,913,000 | 328,641,000
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 262,143,000 | 249,139,000
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 51,770,000 | 79,502,000
U.S. government agency bonds | Fair Value, Measurements, Recurring | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 4,188,000 |
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 1 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 |
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 2 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 4,188,000 |
U.S. government treasury bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 6,503,000 | 15,404,000
Long-term investments | 4,656,000 | 4,606,000
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 6,503,000 | 15,404,000
Long-term investments | 4,656,000 | 4,606,000
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 31,828,000 | 36,510,000
Long-term investments | 11,584,000 | 29,965,000
Corporate bonds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 31,828,000 | 36,510,000
Long-term investments | 11,584,000 | 29,965,000
Municipal bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 691,000 | 2,711,000
Long-term investments |  | 675,000
Municipal bonds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Long-term investments |  | 0
Municipal bonds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 691,000 | 2,711,000
Long-term investments |  | 675,000
U.S. government agency bonds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 1,009,000 | 5,163,000
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 1,009,000 | 5,163,000
Asset-backed securities | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 1,582,000 | 2,909,000
Long-term investments | 888,000 | 1,569,000
Asset-backed securities | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Long-term investments | 0 | 0
Asset-backed securities | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 1,582,000 | 2,909,000
Long-term investments | 888,000 | 1,569,000
Money market funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 250,984,000 | 229,129,000
Money market funds | Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 250,984,000 | 229,129,000
Money market funds | Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | $ 0 | $ 0

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- Definition Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(12)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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