It can be changed.
so how are you using this variable in your final query?
select cast(Latitude as decimal(10, 6)) as Latitude, cast(Longitude as decimal(10, 6)) as Longitude, ClientId from [DB].[Coordinates] where (ClientId) IN (${ActiveCompanyIds})
This is the final query. There are some things to consider:
If the string contains only one value - it should be escaped with single quotes.