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Cryptocurrencies - Summary of additional information about cryptocurrencies (Details) - USD ($) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |
Proceeds from sale of cryptocurrencies | $ (3,009,000) | $ (1,953,000) | $ (9,943,000) | $ (26,871,000)
Unrealized gain on fair value of cryptocurrency, net | 109,000 | 0 |  |
Realized gain on sale of cryptocurrencies and consideration paid | 62,000 | 119,000 | 351,000 | 3,998,000
Impairment of cryptocurrencies | 0 | 48,000 | 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 | 3,220,000 |  | 9,137,000 | 13,496,000
Mining services revenue | 255,000 |  | 844,000 | 884,000
Mining pool operating fees | (7,000) |  | (13,000) | (19,000)
Consideration paid related to operation agreement |  |  | 0 | (461,000)
Proceeds from sale of cryptocurrencies | (3,009,000) |  | (9,943,000) | (26,871,000)
Unrealized gain on fair value of cryptocurrency, net | 62,000 |  | 0 |
Realized gain on sale of cryptocurrencies and consideration paid | 109,000 |  | 351,000 | 3,998,000
Impairment of cryptocurrencies | 0 |  | (285,000) | (6,026,000)
Ending balance | 775,000 |  | 142,000 | $ 51,000
Number of bitcoin held | 11,130 |  | 3,440 |
Average cost basis—per bitcoin | 67,759,000 |  | 41,537,000 |
Fair value—per bitcoin | 69,689,000 |  | 42,288,000 |
Cost basis of bitcoin | 754,000 |  | 142,000 |
Fair value of bitcoin | $ 775,000 |  | $ 145,000 |

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