Note 13. Information about Geographic Areas

We track and allocate revenues by the principal geographic region of our customers’ end users rather than by individual country, which makes it impractical to disclose revenues for the United States or other specific foreign countries. Revenues by geographic area, which is primarily measured by the estimated location of the end users for subscription services revenues and the estimated location of the resources performing the services for professional services, were as follows for the periods shown below (in thousands):

Long-lived assets by geographic area are as follows as of the periods shown below (in thousands):