| Dec 31, 2011 | Dec 31, 2012 | Dec 31, 2013 | Dec 31, 2014 | Dec 31, 2015 | Dec 31, 2016 | Dec 31, 2017 | Dec 31, 2018 | Dec 31, 2019 | Dec 31, 2020 | Dec 31, 2021 | Dec 31, 2022 | Dec 31, 2023 | Dec 31, 2024 |
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| Cash, cash equivalents and restricted cash—beginning of year | - | - | - | - | - | - | - | - | - | - | - | 132 | 129 | 181 |
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| Financial instruments owned, at fair value (including $78,540 and $47,559 invested in WisdomTree products at December 31, 2024 and 2023, respectively) | - | - | - | - | - | - | - | - | - | - | - | 126 | 59 | 85 |
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| Accounts receivable (including $34,959 and $28,511 due from related parties at December 31, 2024 and 2023, respectively) | 6 | 9 | 18 | 18 | 28 | 18 | 21 | 26 | 27 | 29 | 32 | 31 | 35 | 45 |
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| Prepaid expenses | - | - | - | - | - | 3 | 4 | 4 | 4 | 4 | 4 | 5 | 5 | 5 |
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| Other current assets | 2 | 1 | 1 | 2 | 3 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 2 |
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| Total current assets | 33 | 52 | 124 | 189 | 241 | 177 | 154 | 118 | 123 | 142 | 304 | 294 | 230 | 318 |
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| Total | 1 | 0 | 6 | 10 | 12 | 12 | 11 | 9 | 8 | 8 | 1 | 1 | 0 | 0 |
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| Securities held-to-maturity | - | - | - | - | - | 19 | 20 | 20 | 17 | 0 | 0 | 0 | 0 | 0 |
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| Deferred tax assets, net | - | - | - | - | - | - | - | - | - | 8 | 9 | 11 | 11 | 12 |
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| Investments (Note 7) | - | - | - | - | - | - | - | - | 11 | 8 | 14 | 36 | 10 | 9 |
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| Right of use assets—operating leases (Note13) | - | - | - | - | - | - | - | - | 18 | 16 | 1 | 1 | 1 | 1 |
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| Beginning balance | - | - | - | 2 | 2 | 2 | 2 | 86 | 86 | 86 | 86 | 86 | 87 | 87 |
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| Intangible assets, net (Note 24) | - | - | - | - | - | - | - | - | - | - | - | 604 | 605 | 606 |
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| Other noncurrent assets | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 1 | 0 | 0 |
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| Total assets | 43 | 63 | 142 | 221 | 293 | 250 | 255 | 938 | 935 | 897 | 1,038 | 1,034 | 944 | 1,034 |
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| Fund management and administration payable | - | - | - | - | - | 14 | 20 | 23 | 22 | 20 | 21 | 37 | 30 | 31 |
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| Compensation and benefits payable | 4 | 2 | 14 | 14 | 28 | 15 | 28 | 18 | 27 | 23 | 33 | 24 | 38 | 40 |
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| Payable to Gold Bullion Holdings (Jersey) Limited (“GBH”) (Note 12) | - | - | - | - | - | - | - | - | - | - | - | - | 15 | 15 |
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| Income taxes payable | - | - | - | - | - | 5 | - | - | 3 | 1 | 4 | 2 | 4 | 1 |
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| Operating lease liabilities (Note 13) | - | - | - | - | - | - | - | - | 4 | 3 | 0 | 1 | 1 | 1 |
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| Accounts payable and other liabilities | 2 | 3 | 4 | 5 | 8 | 6 | 8 | 8 | 9 | 10 | 9 | 9 | 16 | 22 |
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| Total current liabilities | 17 | 12 | 29 | 29 | 49 | 44 | 57 | 63 | 79 | 74 | 84 | 148 | 103 | 109 |
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| Convertible notes (Note 10) | - | - | - | - | - | - | - | - | - | - | - | - | - | 512 |
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| Payable to GBH (Note 12) | - | - | - | - | - | - | - | - | - | - | - | - | - | 12 |
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| Operating lease liabilities (Note 13) | - | - | - | - | - | - | - | - | 19 | 17 | 0 | 0 | - | 0 |
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| Total liabilities | 17 | 12 | 33 | 36 | 58 | 48 | 62 | 447 | 465 | 498 | 636 | 596 | 402 | 634 |
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| Common stock, par value $0.01; 400,000 shares authorized; issued and outstanding: 146,102 and 150,330 at December 31, 2024 and 2023, respectively | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 1 | 1 | 1 | 2 | 1 |
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| Additional paid-in capital | 164 | 178 | 184 | 209 | - | - | - | - | - | - | - | - | - | 270 |
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| Accumulated other comprehensive loss | - | - | - | -0 | -0 | -0 | 0 | 0 | 1 | 1 | 1 | -1 | -1 | -2 |
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| Retained earnings | -139 | -128 | -76 | -26 | -25 | -25 | -25 | -7 | -18 | -53 | -22 | 14 | 96 | 130 |
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| Total stockholders’ equity | 26 | 51 | 109 | 184 | 235 | 201 | 193 | 358 | 337 | 266 | 269 | 306 | 409 | 400 |
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| Total liabilities and stockholders’ equity | 43 | 63 | 142 | 221 | 293 | 250 | 255 | 938 | 935 | 897 | 1,038 | 1,034 | 944 | 1,034 |
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