Financial Instruments - Fair Value Measured On A Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	$ 57,534	$ 71,972
Marketable securities, long-term	41,978	125,320
Assets measured at fair value	328,641	545,701
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets measured at fair value	249,139	385,938
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets measured at fair value	79,502	159,763
Money market funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	229,129	343,010
Money market funds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	229,129	343,010
Money market funds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	0	0
Corporate bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		1,042
Marketable securities, short-term	36,510	35,065
Marketable securities, long-term	29,965	79,011
Corporate bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		0
Marketable securities, short-term	0	0
Marketable securities, long-term	0	0
Corporate bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		1,042
Marketable securities, short-term	36,510	35,065
Marketable securities, long-term	29,965	79,011
Municipal bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		516
Marketable securities, short-term	2,711	3,657
Marketable securities, long-term	675	3,440
Municipal bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		0
Marketable securities, short-term	0	0
Marketable securities, long-term	0	0
Municipal bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents		516
Marketable securities, short-term	2,711	3,657
Marketable securities, long-term	675	3,440
U.S. government treasury bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	15,404	22,251
Marketable securities, long-term	4,606	20,677
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	15,404	22,251
Marketable securities, long-term	4,606	20,677
U.S. government treasury bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	0	0
Marketable securities, long-term	0	0
Asset-backed securities | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	2,909	10,999
Marketable securities, long-term	1,569	20,992
Asset-backed securities | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	0	0
Marketable securities, long-term	0	0
Asset-backed securities | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, short-term	2,909	10,999
Marketable securities, long-term	1,569	20,992
U.S. government agency bonds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, long-term	5,163	1,200
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, long-term	0	0
U.S. government agency bonds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Marketable securities, long-term	$ 5,163	1,200
Israeli funds | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Israeli funds		3,841
Israeli funds | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Israeli funds		0
Israeli funds | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Israeli funds		$ 3,841