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Cryptocurrencies - Summary of additional information about cryptocurrencies (Details) - USD ($)
 3 Months Ended 12 Months Ended
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