Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Revenues $ 9,820 $ 6,945 $ 16,136 $ 14,597
Cost of revenues 9,931 7,026 16,561 14,544
Gross (loss)/profit (111) (81) (425) 53
Operating expenses        
Sales and marketing expenses 45 78 93 147
General and administrative expenses 1,180 2,498 2,112 4,046
Research and development expenses 0 56 18 124
Total operating expenses 1,225 2,632 2,223 4,317
Loss from operations (1,336) (2,713) (2,648) (4,264)
Other income/(expenses)        
Interest income 79 29 151 75
Other expenses, net (9) (19) (14) (28)
Impairment on long-term investments (209) 0 (209) 0
Change in fair value of warrant liabilities 71 987 172 1,782
Total other income/(expenses) (68) 997 100 1,829
Income tax benefit 1 2 2 4
Net income (loss) (1,403) (1,714) (2,546) (2,431)
Net loss (1,403) (1,714) (2,546) (2,431)
Foreign currency translation adjustment 283 5 202 (17)
Comprehensive loss $ (1,120) $ (1,709) $ (2,344) $ (2,448)
Loss per common share        
Basic and diluted** (in dollars per share) [1] $ (0.19) $ (0.24) $ (0.35) $ (0.34)
Weighted average number of common shares outstanding:        
Basic and diluted** (in shares) [1] 7,195,605 7,114,726 7,185,114 7,097,440
Unrelated Parties [Member]        
Other income/(expenses)        
Loss before income tax benefit $ (1,404) $ (1,716) $ (2,548) $ (2,435)
Related Parties [Member]        
Other income/(expenses)        
Net income (loss) (1,403) (1,714) (2,546) (2,431)
Net loss $ (1,403) $ (1,714) $ (2,546) $ (2,431)
[1] Retrospectively restated for effect of the 1-for-5 reverse stock split effective on January 18, 2023, see Note 4(g).