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Financial Instruments - Fair Value Measured On A Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | $ 86,749 | $ 71,972
Long-term investments | 107,695 | 125,320
Assets measured at fair value | 442,613 | 554,322
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 283,071 | 385,938
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 148,317 | 159,763
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets measured at fair value | 11,225 | 8,621
Money market funds | Fair Value, Measurements, Recurring | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 236,944 | 343,010
Money market funds | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 236,944 | 343,010
Money market funds | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents | 0 | 0
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 31,055 | 22,251
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 15,072 | 20,677
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 1 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 31,055 | 22,251
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 1 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 15,072 | 20,677
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 2 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 2 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 3 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 3 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 1,042
Corporate bonds | Fair Value, Measurements, Recurring | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 41,164 | 35,065
Corporate bonds | Fair Value, Measurements, Recurring | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 72,757 | 79,011
Corporate bonds | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 0
Corporate 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 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 1 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 1,042
Corporate bonds | Fair Value, Measurements, Recurring | Level 2 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 41,164 | 35,065
Corporate bonds | Fair Value, Measurements, Recurring | Level 2 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 72,757 | 79,011
Corporate bonds | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 3 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Corporate bonds | Fair Value, Measurements, Recurring | Level 3 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Municipal bonds | Fair Value, Measurements, Recurring | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 516
Municipal bonds | Fair Value, Measurements, Recurring | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 3,546 | 3,657
Municipal bonds | Fair Value, Measurements, Recurring | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 2,426 | 3,440
Municipal bonds | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 0
Municipal 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 | 0
Municipal bonds | Fair Value, Measurements, Recurring | Level 1 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Municipal bonds | Fair Value, Measurements, Recurring | Level 2 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 516
Municipal bonds | Fair Value, Measurements, Recurring | Level 2 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 3,546 | 3,657
Municipal bonds | Fair Value, Measurements, Recurring | Level 2 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 2,426 | 3,440
Municipal bonds | Fair Value, Measurements, Recurring | Level 3 | Cash equivalents: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash equivalents |  | 0
Municipal bonds | Fair Value, Measurements, Recurring | Level 3 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Municipal bonds | Fair Value, Measurements, Recurring | Level 3 | Long-term investments: |  |
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 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 1,168 | 1,200
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 1 | Long-term investments: |  |
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 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 1,168 | 1,200
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 3 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Asset-backed securities | Fair Value, Measurements, Recurring | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 10,984 | 10,999
Asset-backed securities | Fair Value, Measurements, Recurring | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 16,272 | 20,992
Asset-backed securities | Fair Value, Measurements, Recurring | Level 1 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Asset-backed securities | Fair Value, Measurements, Recurring | Level 1 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Asset-backed securities | Fair Value, Measurements, Recurring | Level 2 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 10,984 | 10,999
Asset-backed securities | Fair Value, Measurements, Recurring | Level 2 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 16,272 | 20,992
Asset-backed securities | Fair Value, Measurements, Recurring | Level 3 | Short-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Short-term investments | 0 | 0
Asset-backed securities | Fair Value, Measurements, Recurring | Level 3 | Long-term investments: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Long-term investments | 0 | 0
Israeli funds | Fair Value, Measurements, Recurring | Prepaid expenses and other current assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds |  | 3,841
Israeli funds | Fair Value, Measurements, Recurring | Level 1 | Prepaid expenses and other current assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds |  | 0
Israeli funds | Fair Value, Measurements, Recurring | Level 2 | Prepaid expenses and other current assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds |  | 3,841
Israeli funds | Fair Value, Measurements, Recurring | Level 3 | Prepaid expenses and other current assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Israeli funds |  | 0
Investments in privately held companies | Fair Value, Nonrecurring | Other assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in privately held companies | 11,225 | 8,621
Investments in privately held companies | Fair Value, Nonrecurring | Level 1 | Other assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in privately held companies | 0 | 0
Investments in privately held companies | Fair Value, Nonrecurring | Level 2 | Other assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in privately held companies | 0 | 0
Investments in privately held companies | Fair Value, Nonrecurring | Level 3 | Other assets: |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments in privately held companies | $ 11,225 | $ 8,621

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26626-111562 + 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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