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Fair Value Measurements - Schedule of Major Categories of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost |  | $ 758,873
Gross Unrealized Holding Loss |  | (2,439)
Gross Unrealized Holding Gain |  | 38
Fair Value |  | 756,472
Cash and Cash Equivalents |  | 388,446
Short-term investments | $ 236,118 | 250,413
Long-term Investments | 86,676 | 29,137
Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Gross Unrealized Holding Loss |  | (101)
Gross Unrealized Holding Gain |  | 18
Fair Value |  | 57,694
Fair Value, Inputs, Level 1, Level 2, and Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 692,168 |
Gross Unrealized Holding Loss | (336) |
Gross Unrealized Holding Gain | 279 |
Fair Value | 692,111 |
Cash and Cash Equivalents | 382,956 |
Short-term investments | 236,118 |
Long-term Investments | 73,037 |
Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 472,319 | 527,834
Gross Unrealized Holding Loss | (164) | (424)
Gross Unrealized Holding Gain | 39 | 4
Fair Value | 472,194 | 527,414
Cash and Cash Equivalents | 376,941 | 377,309
Short-term investments | 60,233 | 61,629
Long-term Investments | 35,020 | 0
Level 1 | Money Market Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 377,021 | 462,866
Gross Unrealized Holding Loss | 0 | 0
Gross Unrealized Holding Gain | 0 | 0
Fair Value | 377,021 | 462,866
Cash and Cash Equivalents | 376,941 | 374,314
Short-term investments | 80 | 76
Long-term Investments | 0 | 0
Funds receivable and seller accounts | 0 | 88,500
Level 1 | U.S. Government securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 95,298 | 64,968
Gross Unrealized Holding Loss | (164) | (424)
Gross Unrealized Holding Gain | 39 | 4
Fair Value | 95,173 | 64,548
Cash and Cash Equivalents | 0 | 2,995
Short-term investments | 60,153 | 61,553
Long-term Investments | 35,020 | 0
Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 213,849 | 231,039
Gross Unrealized Holding Loss | (172) | (2,015)
Gross Unrealized Holding Gain | 240 | 34
Fair Value | 213,917 | 229,058
Cash and Cash Equivalents | 6,015 | 11,137
Short-term investments | 175,885 | 188,784
Long-term Investments | 32,017 | 29,137
Level 2 | U.S. agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 15,635 | 10,053
Gross Unrealized Holding Loss | (14) | (1)
Gross Unrealized Holding Gain | 3 | 3
Fair Value | 15,624 | 10,055
Cash and Cash Equivalents | 0 | 0
Short-term investments | 15,624 | 10,055
Long-term Investments | 0 | 0
Level 2 | Certificate of deposit |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 35,365 | 40,915
Gross Unrealized Holding Loss | (1) | (184)
Gross Unrealized Holding Gain | 55 | 7
Fair Value | 35,419 | 40,738
Cash and Cash Equivalents | 0 | 5,471
Short-term investments | 35,419 | 35,267
Long-term Investments | 0 | 0
Level 2 | Commercial paper |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 62,463 | 57,777
Gross Unrealized Holding Loss | (12) |
Gross Unrealized Holding Gain | 54 |
Fair Value | 62,505 |
Cash and Cash Equivalents | 4,449 | 4,454
Short-term investments | 58,056 | 53,240
Long-term Investments | 0 | 0
Level 2 | Corporate bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 100,386 | 122,294
Gross Unrealized Holding Loss | (145) | (1,729)
Gross Unrealized Holding Gain | 128 | 6
Fair Value | 100,369 | 120,571
Cash and Cash Equivalents | 1,566 | 1,212
Short-term investments | 66,786 | 90,222
Long-term Investments | 32,017 | $ 29,137
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 6,000 |
Gross Unrealized Holding Loss | 0 |
Gross Unrealized Holding Gain | 0 |
Fair Value | 6,000 |
Cash and Cash Equivalents | 0 |
Short-term investments | 0 |
Long-term Investments | 6,000 |
Level 3 | Loans receivable - held for investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost | 6,000 |
Gross Unrealized Holding Loss | 0 |
Gross Unrealized Holding Gain | 0 |
Fair Value | 6,000 |
Cash and Cash Equivalents | 0 |
Short-term investments | 0 |
Long-term Investments | 6,000 |
Measured at NAV | Third-party managed funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term Investments | $ 13,639 |

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