Ability to report on number of ideas updated by each Aha user

Internally, we would like to institute metrics related to number of Aha ideas updated per internal Aha users (employees). An update would be specific to updating the status of an idea with a default status. (eg. user1 updated status from Needs Review to Awaiting Votes). 

Would aid us in idea maintenance engagement amongst our staff. 

See this information is available within the idea history, but don't see a way to report on this via Pivot reporting.