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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

$