v3.26.1
SEGMENT REPORTING - Summary information by segment for continuing operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
SEGMENT REPORTING      
Total segment and consolidated revenues $ 23,000 $ 32,922 $ 43,101
Total segment and consolidated cost of revenue-exclusive depreciation and amortization (23,716) (18,582) (29,107)
Total segment and consolidated cost of revenue-depreciation and amortization (10,073) (11,355) (10,948)
Total segment and consolidated cost (33,789) (29,937) (40,055)
Reconciling items:      
Sales and marketing expenses (47) (54) (153)
General and administrative expenses - payroll (5,393) (5,675) (5,967)
General and administrative expenses - others (12,858) (8,034) (12,498)
Service development expenses   (69) (874)
Operating expenses (18,298) (13,832) (19,492)
Other operating income 9,715 214 180
Other operating expenses (3,035) (613) (13,642)
Net gain on disposal of cryptocurrency assets     7,074
Impairment of cryptocurrency assets     (2,359)
Changes in fair value of cryptocurrency assets 4,356 (3,203)  
Impairment of property and equipment:      
Impairment of property and equipment (8,764)    
Impairment of intangible assets:      
Impairment of intangible assets (1,405)    
Changes in fair value of cryptocurrency assets (4,356) 3,203  
Gain on remeasurement of unfavorable contract 2,225    
Changes in fair value of payables settled by cryptocurrency assets 7 37  
Operating loss from continuing operations 34,700 8,006 25,193
Other income, net 54 627 691
Interest income 146 56 242
Loss from equity method investments (1) (20) (295)
Impairment of long-term investments 0 (132) (1,408)
Gain from disposal of long-term investments     614
Gain from short-term investments   156  
Changes in fair value of derivative instruments 21 311 (35)
Net loss from continuing operations (34,480) (7,008) (25,384)
Operating segments      
SEGMENT REPORTING      
Total segment gross profit (loss) (10,789) 2,985 3,046
Inter-segment      
SEGMENT REPORTING      
Total segment and consolidated revenues (7,568) (12,558) (11,943)
Total segment and consolidated cost of revenue-exclusive depreciation and amortization 7,568 12,558 11,943
Data center      
Reconciling items:      
General and administrative expenses - payroll (2,195) (1,951) (2,033)
Impairment of intangible assets:      
Impairment of intangible assets (1,405)    
Gain on remeasurement of unfavorable contract 2,225    
Data center | Operating segments      
SEGMENT REPORTING      
Total segment and consolidated revenues 23,898 28,389 33,482
Total segment and consolidated cost of revenue-exclusive depreciation and amortization (23,697) (16,877) (21,834)
Total segment and consolidated cost of revenue-depreciation and amortization (2,643) (2,642) (2,480)
Total segment gross profit (loss) (10,010) (3,688) (2,775)
Data center | Inter-segment      
SEGMENT REPORTING      
Total segment and consolidated revenues 7,568 12,558 11,943
Cryptocurrency mining      
Reconciling items:      
General and administrative expenses - payroll (193) (52) (13)
Impairment of property and equipment:      
Impairment of property and equipment (8,764)    
Cryptocurrency mining | Operating segments      
SEGMENT REPORTING      
Total segment and consolidated revenues 6,670 17,091 21,562
Total segment and consolidated cost of revenue-exclusive depreciation and amortization (7,587) (14,263) (19,216)
Total segment and consolidated cost of revenue-depreciation and amortization (7,430) (8,713) (8,468)
Total segment gross profit (loss) (779) 6,673 5,821
Other operating segment      
Reconciling items:      
General and administrative expenses - payroll $ (3,005) $ (3,672) $ (3,921)