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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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