v3.26.1
Fair Value Measurements - Schedule of Cost, Gross Unrealized Losses, Gross Unrealized Gains, and Fair Values Company’s Investments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments $ 221,007 $ 224,088
Long-term Investments 160,665 134,376
Fair Value, Inputs, Level 1, Level 2, and Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 1,056,334 1,289,990
Gross Unrealized Holding Loss (704) (12)
Gross Unrealized Holding Gain 97 809
Fair Value 1,055,727 1,290,787
Cash and Cash Equivalents 661,883 946,932
Short-term Investments 221,007 222,088
Long-term Investments 145,621 121,767
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 760,524 1,023,748
Gross Unrealized Holding Loss (176) 0
Gross Unrealized Holding Gain 7 204
Fair Value 760,355 1,023,952
Cash and Cash Equivalents 658,891 946,932
Short-term Investments 47,166 52,002
Long-term Investments 27,082 25,018
Level 1 | Money market funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 686,107 946,932
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 0 0
Fair Value 686,107 946,932
Cash and Cash Equivalents 658,891 946,932
Short-term Investments 0 0
Long-term Investments 0 0
Level 1 | Money market funds | Location, Statement of Financial Position, Balance [Axis]: etsy:FundsReceivableAndSellerAccountsCurrent    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 27,200  
Level 1 | U.S. Government securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 74,417 76,816
Gross Unrealized Holding Loss (176) 0
Gross Unrealized Holding Gain 7 204
Fair Value 74,248 77,020
Cash and Cash Equivalents 0 0
Short-term Investments 47,166 52,002
Long-term Investments 27,082 25,018
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 278,310 253,242
Gross Unrealized Holding Loss (528) (12)
Gross Unrealized Holding Gain 90 605
Fair Value 277,872 253,835
Cash and Cash Equivalents 2,992 0
Short-term Investments 169,841 170,086
Long-term Investments 105,039 83,749
Level 2 | Certificate of deposit    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 15,354 20,913
Gross Unrealized Holding Loss (6) 0
Gross Unrealized Holding Gain 4 30
Fair Value 15,352 20,943
Cash and Cash Equivalents 0 0
Short-term Investments 15,352 19,240
Long-term Investments 0 1,703
Level 2 | Commercial paper    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 46,467 32,409
Gross Unrealized Holding Loss (38) 0
Gross Unrealized Holding Gain 1 26
Fair Value 46,430 32,435
Cash and Cash Equivalents 2,992 0
Short-term Investments 43,438 32,435
Long-term Investments 0 0
Level 2 | Corporate bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 216,489 199,920
Gross Unrealized Holding Loss (484) (12)
Gross Unrealized Holding Gain 85 549
Fair Value 216,090 200,457
Cash and Cash Equivalents 0 0
Short-term Investments 111,051 118,411
Long-term Investments 105,039 82,046
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 17,500 13,000
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 0 0
Fair Value 17,500 13,000
Cash and Cash Equivalents 0 0
Short-term Investments 4,000 0
Long-term Investments 13,500 13,000
Level 3 | Loans receivable - held for investment    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 17,500 13,000
Gross Unrealized Holding Loss 0 0
Gross Unrealized Holding Gain 0 0
Fair Value 17,500 13,000
Cash and Cash Equivalents 0 0
Short-term Investments 4,000 0
Long-term Investments 13,500 13,000
Measured at NAV | Third-party managed funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Short-term Investments   2,000
Long-term Investments $ 15,044 $ 12,609