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Fair Value Measurements - Schedule of Fair Values Company’s Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost $ 2,587,252 $ 1,747,022
Gross Unrealized Holding Loss (99) (10)
Gross Unrealized Holding Gain 257 478
Fair Value 2,587,410 1,747,490
Cash and Cash Equivalents 2,053,882 1,244,099
Short-term investments 430,727 425,119
Long-term investments 102,801 39,094
Cash    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 162,196 346,136
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 0 0
Fair Value 162,196 346,136
Cash and Cash Equivalents 162,196 346,136
Short-term investments 0 0
Long-term investments 0 0
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 2,160,706 1,331,014
Gross Unrealized Holding Loss 0 (3)
Gross Unrealized Holding Gain 130 358
Fair Value 2,160,836 1,331,369
Cash and Cash Equivalents 1,891,686 881,465
Short-term investments 269,150 376,089
Long-term investments 0 34,637
Level 1 | U.S. Government and agency securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 269,020 410,371
Gross Unrealized Holding Loss 0 (3)
Gross Unrealized Holding Gain 130 358
Fair Value 269,150 410,726
Cash and Cash Equivalents 0 0
Short-term investments 269,150 376,089
Long-term investments 0 34,637
Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 1,891,686 920,643
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 0 0
Fair Value 1,891,686 920,643
Cash and Cash Equivalents 1,891,686 881,465
Short-term investments 0 0
Long-term investments 0 0
Funds receivable and seller accounts   39,200
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 264,350 69,872
Gross Unrealized Holding Loss (99) (7)
Gross Unrealized Holding Gain 127 120
Fair Value 264,378 69,985
Cash and Cash Equivalents 0 16,498
Short-term investments 161,577 49,030
Long-term investments 102,801 4,457
Level 2 | Certificate of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 27,953 12,746
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 11 5
Fair Value 27,964 12,751
Cash and Cash Equivalents 0 6,000
Short-term investments 27,964 6,751
Long-term investments 0 0
Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 46,744 14,494
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 17 4
Fair Value 46,761 14,498
Cash and Cash Equivalents 0 10,498
Short-term investments 46,761 4,000
Long-term investments 0 0
Level 2 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 189,653 42,632
Gross Unrealized Holding Loss (99) (7)
Gross Unrealized Holding Gain 99 111
Fair Value 189,653 42,736
Cash and Cash Equivalents 0 0
Short-term investments 86,852 38,279
Long-term investments $ 102,801 $ 4,457