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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