Check in InDesign documents as TOR documents ... and then, let them edit online.
With the TOR management console for the manager, work is done centrally and InDesign documents can be checked in. Clients and single user see and edit their online TOR document with the TOR Online Editor. Only the customer or reviewer works with the TOR Online Editor. After that the manager retrieves the changes directly into his InDesign document.
That´s so very easy.