Inventories (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Inventories
Infrared cameras	$ 2,740		$ 2,740		$ 4,955
Replacement, maintenance, and spare parts	1,520		1,520		1,975
Inventories, current	4,260		4,260		6,930
Infrared cameras	203		203		389
Replacement, maintenance, and spare parts	736		736		254
Inventories, noncurrent	939		939		643
Total inventories	5,199		5,199		$ 7,573
Inventories impairment	$ 2,038	$ 0	$ 2,272	$ 1,386