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Financial Instruments - Fair Value Measured On A Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Short-term investments	$ 22,138	$ 71,972
Long-term investments	77,551	125,320
Assets measured at fair value	230,618	554,322
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets measured at fair value	137,250	385,938
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets measured at fair value	81,575	159,763
Level 3
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets measured at fair value	11,793	8,621
Money market funds | Fair Value, Measurements, Recurring | Cash equivalents:
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	119,136	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	119,136	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	6,490	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	11,624	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	6,490	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	11,624	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	8,488	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	59,508	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	8,488	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	59,508	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	4,047	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	1,394	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	4,047	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	1,394	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	1,155	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	1,155	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	3,113	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	3,870	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	3,113	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	3,870	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	11,793	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	$ 11,793	$ 8,621

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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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.

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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.

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