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Intangible assets
 12 Months Ended
Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets Intangible assets
Intangible assets consist of the following as of December 31, 2024 and 2023.
Gross Carrying
Amount		Accumulated
Amortization		Net Carrying Amount
December 31, 2024
Definite-lived: Data access agreement$250 $107 $143 
Indefinite-lived: Data purchases328 - 328 
$578 $107 $471 
December 31, 2023
Definite-lived: Data access agreement$272 $97 $175 
Indefinite-lived: Data purchases339 - 339 
$611 $97 $514 
Aggregate intangible asset amortization expense was $19 for the years ended December 31, 2024, 2023 and 2022 and was recorded in depreciation, amortization and accretion expense in the consolidated statements of operations.

Estimated future intangible asset amortization expense based upon the carrying value as of December 31, 2024 is as follows (in thousands):
20252026202720282029Thereafter
Amortization expense$19 $19 $19 $19 $19 $48