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Financial Instruments - Schedule of Cash, Cash Equivalents and Available-for-Sale Securities by Significant Investment Category (Detail) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 1,471,260 | $ 1,345,801 |
Gross Unrealized Gains | 2,526 | 5,069 |
Gross Unrealized Losses | (152) | (11) |
Aggregate Fair Value | 1,473,634 | 1,350,859 |
Cash and Cash Equivalents | 641,533 | 649,158 | [1]
Short-term Marketable Securities | 481,864 | 416,228 | [1]
Long-term Marketable Securities | 350,237 | 285,473 | [1]
Level 1: | Cash |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Cash | 348,830 | 370,325 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Aggregate Fair Value | 348,830 | 370,325 |
Cash and Cash Equivalents | 348,830 | 370,325 |
Short-term Marketable Securities | 0 | 0 |
Long-term Marketable Securities | 0 | 0 |
Level 2: |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,122,430 | 975,476 |
Gross Unrealized Gains | 2,526 | 5,069 |
Gross Unrealized Losses | (152) | (11) |
Aggregate Fair Value | 1,124,804 | 980,534 |
Cash and Cash Equivalents | 292,703 | 278,833 |
Short-term Marketable Securities | 481,864 | 416,228 |
Long-term Marketable Securities | 350,237 | 285,473 |
Level 2: | Money market instruments |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 249,556 | 264,833 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Aggregate Fair Value | 249,556 | 264,833 |
Cash and Cash Equivalents | 249,556 | 264,833 |
Short-term Marketable Securities | 0 | 0 |
Long-term Marketable Securities | 0 | 0 |
Level 2: | Corporate debt securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 426,514 | 413,137 |
Gross Unrealized Gains | 1,639 | 3,261 |
Gross Unrealized Losses | (110) | (8) |
Aggregate Fair Value | 428,043 | 416,390 |
Cash and Cash Equivalents | 0 | 0 |
Short-term Marketable Securities | 168,393 | 220,551 |
Long-term Marketable Securities | 259,650 | 195,839 |
Level 2: | U.S. government agency securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 253,923 | 265,298 |
Gross Unrealized Gains | 685 | 1,555 |
Gross Unrealized Losses | (30) | (1) |
Aggregate Fair Value | 254,578 | 266,852 |
Cash and Cash Equivalents | 27,999 | 14,000 |
Short-term Marketable Securities | 166,491 | 192,488 |
Long-term Marketable Securities | 60,088 | 60,364 |
Level 2: | Commercial paper |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 153,334 |  |
Gross Unrealized Gains | 3 |  |
Gross Unrealized Losses | 0 |  |
Aggregate Fair Value | 153,337 |  |
Cash and Cash Equivalents | 15,148 |  |
Short-term Marketable Securities | 138,189 |  |
Long-term Marketable Securities | 0 |  |
Level 2: | Asset-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 38,553 | 31,659 |
Gross Unrealized Gains | 42 | 85 |
Gross Unrealized Losses | (12) | (2) |
Aggregate Fair Value | 38,583 | 31,742 |
Cash and Cash Equivalents | 0 | 0 |
Short-term Marketable Securities | 8,282 | 3,189 |
Long-term Marketable Securities | 30,301 | 28,553 |
Level 2: | Foreign and other |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 550 | 549 |
Gross Unrealized Gains | 157 | 168 |
Gross Unrealized Losses | 0 | 0 |
Aggregate Fair Value | 707 | 717 |
Cash and Cash Equivalents | 0 | 0 |
Short-term Marketable Securities | 509 | 0 |
Long-term Marketable Securities | $ 198 | $ 717 |
Minimum |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Long term marketable securities maturity period | 1 year | 1 year |
Maximum |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Short term marketable securities maturity period | 1 year | 1 year |
Long term marketable securities maturity period | 5 years | 5 years |
[1] | (1)December 31, 2020 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2020, filed with the SEC on February 26, 2021.

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