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Cryptocurrencies - Summary of additional information about cryptocurrencies (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Proceeds from sale of cryptocurrencies |  |  | $ (6,025,000) | $ (4,049,000) | $ (9,943,000) | $ (26,871,000)
Unrealized gain on fair value of cryptocurrency, net | $ (63,000) | $ 0 | 46,000 | 0 |  |
Realized gain on sale of cryptocurrencies and consideration paid | (50,000) | 110,000 | 12,000 | 229,000 | 351,000 | 3,998,000
Impairment of cryptocurrencies | 0 | 97,000 | 0 | 144,000 | 285,000 | 6,026,000
Cryptocurrencies [Member] |  |  |  |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Beginning balance |  |  | 142,000 | 51,000 | 51,000 | 15,050,000
Cumulative effect of change in accounting principle |  |  | 3,000 | 0 |  |
Cryptocurrencies received from mining |  |  | 5,475,000 | 3,644,000 | 9,137,000 | 13,496,000
Mining services revenue |  |  | 458,000 | 529,000 | 844,000 | 884,000
Mining pool operating fees |  |  | (15,000) | 0 | (13,000) | (19,000)
Consideration paid related to operation agreement |  |  |  |  | 0 | (461,000)
Proceeds from sale of cryptocurrencies |  |  | (6,025,000) | (4,049,000) | (9,943,000) | (26,871,000)
Unrealized gain on fair value of cryptocurrency, net |  |  | 46,000 | 0 |  |
Realized gain on sale of cryptocurrencies and consideration paid |  |  | 12,000 | 229,000 | 351,000 | 3,998,000
Impairment of cryptocurrencies |  |  | 0 | (144,000) | (285,000) | (6,026,000)
Ending balance | $ 96,000 | $ 260,000 | 96,000 | 260,000 | $ 142,000 | $ 51,000
Number of bitcoin held |  |  | 1,570 | 8,850 |  |
Average cost basis - per bitcoin |  |  | 61,454,000 | 27,540,000 |  |
Fair value - per bitcoin |  |  | 63,364,000 | 28,010,000 |  |
Cost basis of bitcoin |  |  | 96,000 | 260,000 |  |
Fair value of bitcoin |  |  | $ 99,000 | $ 263,000 |  |

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