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v3.24.1.1.u2

Inventories (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Inventories |  |
Summary of inventories | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, | ​ | December 31,
​ | ​ | 2024 |  | 2023
​ | ​ | ​ | ​ | ​ | ​ | ​
Infrared cameras | ​ | $ | 4,334 | ​ | $ | 4,955
Replacement, maintenance, and spare parts | ​ |  | 1,230 | ​ |  | 1,975
Inventories, current | ​ | $ | 5,564 | ​ | $ | 6,930
​ | ​ | ​ | ​ | ​ | ​ | ​
Infrared cameras | ​ | $ | 440 | ​ | $ | 389
Replacement, maintenance, and spare parts | ​ |  | 1,104 | ​ |  | 254
Inventories, noncurrent | ​ | $ | 1,544 | ​ | $ | 643
Total inventories | ​ | $ | 7,108 | ​ | $ | 7,573
| ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022
Infrared cameras | ​ | $ | 4,955 | ​ | $ | 5,904
Replacement, maintenance, and spare parts | ​ |  | 1,975 | ​ |  | 3,730
Inventories, current | ​ | $ | 6,930 | ​ | $ | 9,634
Infrared cameras | ​ | $ | 389 | ​ | $ | —
Replacement, maintenance, and spare parts | ​ |  | 254 | ​ |  | —
Inventories, noncurrent | ​ | $ | 643 | ​ | $ | —
Total inventories | ​ | $ | 7,573 | ​ | $ | 9,634
Summary of amount of inventory write-downs to net realizable value |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2023 |  | 2022
Amount of inventory write-down to net realizable value | ​ | $ | 1,689 | ​ | $ | —
​

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