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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