| Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Net income (loss) including redeemable non-controlling interests | - | - | -1,368 | -565 | 117 |
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| Depreciation and amortization | 120 | 156 | 369 | 509 | 561 |
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| Stock-based compensation | 322 | 486 | 889 | 1,088 | 1,099 |
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| Reduction of operating lease right-of-use assets and accretion of operating lease liabilities | 40 | 52 | 81 | 108 | 103 |
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| Office lease impairment expenses | - | - | - | - | 83 |
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| Adjustments to non-marketable equity securities, including impairment, net | - | - | 303 | 101 | 4 |
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| Other | 18 | 28 | 20 | 15 | 29 |
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| Funds held at payment processors | 96 | 174 | 86 | -86 | 87 |
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| Accounts receivable, net | 248 | 94 | 33 | 141 | 222 |
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| Prepaid expenses and other current assets | 96 | -85 | 165 | 105 | 146 |
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| Other assets | 20 | 51 | 90 | 96 | 279 |
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| Accounts payable | 54 | 79 | -15 | 70 | 82 |
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| Increase (Decrease) in Accrued Liabilities | 587 | 595 | 566 | 702 | 943 |
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| Payments for operating lease liabilities | 26 | 44 | 75 | 113 | 116 |
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| Other liabilities | 11 | -5 | -29 | 14 | -39 |
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| Net cash provided by operating activities | 252 | 692 | 367 | 1,673 | 2,132 |
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| Purchases of property and equipment | 106 | 129 | 176 | 123 | 104 |
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| Capitalized software and website development costs | 53 | 108 | 170 | 201 | 226 |
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| Purchases of marketable securities | 593 | 2,344 | 1,948 | 1,946 | 1,951 |
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| Maturities of marketable securities | 583 | 720 | 1,552 | 1,940 | 1,774 |
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| Sales of marketable securities | - | 224 | 387 | 7 | 70 |
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| Purchases of non-marketable equity securities | - | 409 | 15 | 17 | - |
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| Net cash acquired in acquisitions | 28 | - | -71 | - | - |
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| Other investing activities | -1 | 1 | 1 | 2 | 7 |
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| Net cash used in investing activities | -192 | -2,047 | -300 | -342 | -444 |
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| Proceeds from Stock Options Exercised | 5 | 32 | 11 | 6 | 14 |
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| Repurchase of common stock | - | - | 400 | 750 | 224 |
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| Other financing activities | - | - | 14 | -8 | 6 |
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| Net cash used in financing activities | 3,996 | -483 | -375 | -752 | -204 |
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| Foreign currency effect on cash, cash equivalents, and restricted cash | 2 | -1 | -10 | 5 | -35 |
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| Net increase (decrease) in cash, cash equivalents, and restricted cash | 4,058 | -1,839 | -318 | 584 | 1,449 |
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