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Inventories (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Inventories      
Infrared cameras $ 4,334 $ 4,955 $ 5,904
Replacement, maintenance, and spare parts 1,230 1,975 3,730
Inventories, current 5,564 6,930 9,634
Infrared cameras 440 389  
Replacement, maintenance, and spare parts 1,104 254  
Inventories, noncurrent 1,544 643  
Total inventories 7,108 7,573 9,634
Impairment on inventories   1,689  
Inventory write down $ 234 $ 1,689 $ 0