@Rakesh - you're looking for the wrong place. You supply customID feilds, in your example you supply CONTENT_TYPE: IdType . You do not need at least 10 users to see the data ... if you have only 1 user, the data will be displayed for 24 hours from this user using your application.
I will say this, initially finding your own identifiers is not very straightforward ... it took me a while to find it.
The place where you can find this information: Anaylytics - Events - once on this page click on the actual CONTENT_TYPE that you want to track, in your example above, it will be idType 
Then, on the Content graph, you will see your identifiers (for example: someID) ... click someID . In my case (and in my screenshots) my equivalent someIDs is a field, a button and select " 
and then you will see all the data related to the values (someIDName) that you passed in someID . 
Now, if idType does not appear for you, it may be due to the fact that Firebase does not allow you to create your own CONTENT_TYPE , I am not sure that you can do that as I have not tried ... in which case you will need use the predefined CONTENT_TYPE . I do not use custom idType , I use CONTENT_TYPE: select_content .
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