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Financial Instruments - Amortized Cost, Unrealized Gains and Losses, and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Debt Securities, Available-for-Sale [Line Items] |  |  |
Fair Value | $ 259,251 |  | $ 0
Cash and Cash Equivalents | 283,043 | $ 227,380 |
Marketable securities | 237,074 | 342,975 |
Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross Unrealized Gains | 57 | 41 |
Gross Unrealized Losses | (44) | (414) |
Total cash, cash equivalents, and marketable securities | 520,104 | 570,728 |
Total cash, cash equivalents, and marketable securities | 520,117 | 570,355 |
Fair Value, Inputs, Level 1 |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 260,866 | 218,881 |
Marketable securities | 138,923 | 201,414 |
Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross Unrealized Gains | 38 | 9 |
Gross Unrealized Losses | (8) | (180) |
Total cash, cash equivalents, and marketable securities | 399,759 | 420,466 |
Total cash, cash equivalents, and marketable securities | 399,789 | 420,295 |
Fair Value, Inputs, Level 2 |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 22,177 | 8,499 |
Marketable securities | 98,151 | 141,561 |
Fair Value, Inputs, Level 2 | Commercial paper |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 6,495 | 0 |
Marketable securities | 19,404 | 41,348 |
Fair Value, Inputs, Level 2 | Certificates of deposit |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 3,010 |  |
Marketable securities | 4,758 | 6,116 |
Fair Value, Inputs, Level 2 | Corporate notes and obligations |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 12,672 | 1,519 |
Marketable securities | 58,864 | 62,201 |
Fair Value, Inputs, Level 2 | Asset-backed securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Marketable securities | 7,316 | 15,138 |
Fair Value, Inputs, Level 2 | U.S. agency securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 0 | 6,980 |
Marketable securities | 7,809 | 16,758 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Gross Unrealized Gains | 19 | 32 |
Gross Unrealized Losses | (36) | (234) |
Total cash, cash equivalents, and marketable securities | 120,345 | 150,262 |
Total cash, cash equivalents, and marketable securities | 120,328 | 150,060 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Commercial paper |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 25,899 | 41,348 |
Fair Value | 25,899 | 41,348 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Certificates of deposit |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 7,768 | 6,116 |
Fair Value | 7,768 | 6,116 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Corporate notes and obligations |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 71,545 | 63,912 |
Gross Unrealized Gains | 12 | 10 |
Gross Unrealized Losses | (21) | (202) |
Fair Value | 71,536 | 63,720 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring | Asset-backed securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 7,319 | 15,150 |
Gross Unrealized Gains | 7 | 17 |
Gross Unrealized Losses | (10) | (29) |
Fair Value | 7,316 | 15,138 |
Fair Value, Inputs, Level 2 | Fair Value, Recurring | U.S. agency securities |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 7,814 | 23,736 |
Gross Unrealized Gains | 0 | 5 |
Gross Unrealized Losses | (5) | (3) |
Fair Value | 7,809 | 23,738 |
Cash | Fair Value, Inputs, Level 1 |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 237,104 | 166,341 |
Cash | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and cash equivalent | 237,104 | 166,341 |
Money market mutual funds |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents |  |  | $ 0
Money market mutual funds | Fair Value, Inputs, Level 1 |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 23,762 | 49,545 |
Money market mutual funds | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and cash equivalent | 23,762 | 49,545 |
U.S. treasury securities | Fair Value, Inputs, Level 1 |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Cash and Cash Equivalents | 0 | 2,995 |
Marketable securities | 138,923 | 201,414 |
U.S. treasury securities | Fair Value, Inputs, Level 1 | Fair Value, Recurring |  |  |
Debt Securities, Available-for-Sale [Line Items] |  |  |
Amortized Cost Basis | 138,893 | 204,580 |
Gross Unrealized Gains | 38 | 9 |
Gross Unrealized Losses | (8) | (180) |
Fair Value | $ 138,923 | $ 204,409 |

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