Our fiscal year ends on
Sources of Revenues
We derive our revenues from two sources: (1) subscription revenues, which are comprised of subscription fees from customers accessing our enterprise cloud computing services and from customers purchasing additional support beyond the standard support that is included in the basic subscription fees; and (2) related professional services such as process mapping, project management, implementation services and other revenue. "Other revenue" consists primarily of training fees. Subscription and support revenues accounted for approximately 94 percent of our total revenues for the six months ended
July 31, 2013. Subscription revenues are driven primarily by the number of paying subscribers, varying service types, the price of our service and service renewal rates. We define a "customer" as a separate and distinct buying entity (e.g., a company, a distinct business unit of a large corporation, a partnership, etc.) that has entered into a contract to access our enterprise cloud computing services. We define a "subscription" as a unique user account purchased by a customer for use by its employees or other customer-authorized users, and we refer to each such user as a "subscriber." The number of paying subscriptions at each of our customers ranges from one to hundreds of thousands. None of our customers accounted for more than five percent of our revenues during the six months ended July 312013 and 2012. Subscription and support revenues are recognized ratably over the contract terms beginning on the commencement dates of each contract. The typical subscription and support term is 12 to 36 months, although terms range from one to 60 months. Our subscription and support contracts are non-cancelable, though customers typically have the right to terminate their contracts for cause if we materially fail to perform. We generally invoice our customers in advance, in annual or quarterly installments, and typical payment terms provide that our customers pay us within 30 days of invoice. Amounts that have been invoiced are recorded in accounts receivable and in deferred revenue, or in revenue depending on whether the revenue recognition criteria have been met. In general, we collect our billings in advance of the subscription service period. Professional services and other revenues consist of fees associated with consulting and implementation services and training. Our consulting and implementation engagements are typically billed on a time and materials basis. We also offer a number of training classes on implementing, using and administering our service that are billed on a per person, per class basis. Our typical professional services payment terms provide that our customers pay us within 30 days of invoice. In determining whether professional services can be accounted for separately from subscription and support revenues, we consider a number of factors, which are described in "Critical Accounting Estimates-Revenue Recognition" below.
Seasonal Nature of Deferred Revenue and Accounts Receivable
Deferred revenue primarily consists of billings to customers for our subscription service. Over 90 percent of the value of our billings to customers is for our subscription and support service. We generally invoice our customers in either annual or quarterly cycles. Occasionally, we bill customers for their multi-year contract on a single invoice which results in an increase in noncurrent deferred revenue. We typically issue renewal invoices 30 days in advance of the renewal service period, and depending on timing, the initial invoice for the subscription and services contract and the subsequent renewal invoice may occur in different quarters. This may result in an increase in deferred revenue and accounts receivable. There is a disproportionate weighting towards annual billings in the fourth quarter, primarily as a result of large enterprise account buying patterns. Our fourth quarter has historically been our strongest quarter for new business and renewals. The year on year compounding effect of this seasonality in both billing patterns and overall new and renewal business causes the value of invoices that we generate in the fourth quarter for both new business and renewals to increase as a proportion of our total annual billings. Approximately 70 percent of all invoices were issued with annual terms during the three months ended
July 31, 2013.