Moderators might want to monitor all ideas especially that are in pending approval stage before making them live in the community. Ideas that require moderation approval (if set by administrator from community settings) or ideas that were flagged inappropriate are queued up in pending approval stage can approved from moderation panel by editing (if required) and moving them to next stage.
To review the ideas that are placed in the moderation panel, first login as a moderator in your community. Once logged in, you'll see a "Moderator" link on the top right corner of your screen. Click this link to take you to your moderation mode.
A new page will open with link to view the 'Content moderation' (which contains pending ideas and comments) and 'Member moderation' (which contains pending members and list of approved members).
Choosing these links will display all the users or ideas that need to be approved. Each idea will have an Action menu - when clicked on, will display the option to change the status of an idea
Furthermore, it is possible to bulk approve or delete ideas, move ideas from one campaign to another (without campaign specific custom fields), one stage to another or merge two similar/duplicate ideas from this same moderation panel.
Help article on merge ideas: http://support.ideascale.com/customer/portal/articles/1001390-moderation-merge-ideas