Revenue Recognition
We sell our products primarily through a direct sales force. In certain international markets, we sell our products through independent distributors or dealers. We consider revenue to be earned when all of the applicable criteria are met in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Topic 606, Revenue from Contracts with Customers.
Transfer of control is evidenced upon passage of title and risk of loss to the customer unless we are required to provide additional services. We treat shipping and handling costs performed after a customer obtains control of the good as a fulfillment cost and record these costs as a component of Selling, general and administrative expenses when incurred. We recognize revenue from consignment arrangements based on product usage, or implant, which indicates that the sale is complete. We recognize a receivable at the point in time we have an unconditional right to payment. Payment terms are typically 30 days in the U.S. but may be longer in international markets.
Many of our Cardiac Rhythm Management (CRM) product offerings combine the sale of a device with our LATITUDE™ Patient Management System, which represents a future service obligation. Similarly, arrangements that include the sale of capital equipment may include multiple performance obligations. For contracts with multiple performance obligations, the total transaction price is allocated to each performance obligation in an amount based on the estimated relative standalone selling price of each distinct good or service in the contract. For goods or services for which observable standalone selling prices are not available, or if sales volume is not sufficient, we estimate the standalone selling price considering entity-specific factors including, but not limited to, the expected cost and margin of the product or service. The use of alternative estimates could result in a different amount of revenue deferral.
Deferred Revenue
We record a contract liability, or deferred revenue, when we have an obligation to provide a product or service to the customer and payment is received or due in advance of our performance. When we sell a device with a future service obligation, we defer revenue on the unfulfilled performance obligation and recognize this revenue over the related service period.
Contract liabilities are classified within Other current liabilities and Other long-term liabilities on our accompanying consolidated balance sheets. Our contract liabilities are primarily composed of deferred revenue related to the LATITUDE™ Patient Management System. Revenue is recognized over the average service period which is based on device and patient longevity. Our contract liabilities also include deferred revenue related to the LUX-Dx II+™ Insertable Cardiac Monitor system, also within our CRM business, for which revenue is recognized over the average service period based on device longevity and usage. We have elected not to disclose the transaction price allocated to unsatisfied performance obligations when the original expected contract duration is one year or less. In addition, we have not identified material unfulfilled performance obligations for which revenue is not currently deferred.
Variable Consideration
We generally allow our customers to return defective, damaged and, in certain cases, expired products for credit. We base our estimate for sales returns upon historical trends and record the amount as a reduction to revenue when we sell the initial product. In addition, we may allow customers to return previously purchased products for next-generation product offerings. For these transactions, we defer recognition of revenue on the sale of the earlier generation product based upon an estimate of the amount of product to be returned when the next-generation products are shipped to the customer. Uncertain timing of next-generation product approvals, variability in product launch strategies, product recalls and variation in product utilization all affect our estimates related to sales returns and could cause actual returns to differ from these estimates.
We also offer sales rebates and discounts to certain customers. We treat sales rebates and discounts as a reduction of revenue and classify the corresponding liability as current. We estimate rebates for products where there is sufficient historical information available to predict the volume of expected future rebates. If we are unable to reasonably estimate the expected rebates, we record a liability for the maximum rebate percentage offered. We have entered certain agreements with group purchasing organizations to sell our products to participating hospitals at negotiated prices. We recognize revenue from these agreements following the same revenue recognition criteria discussed above.
Post-Implant Services
We provide non-contractual services to customers, where necessary, to ensure the safe and effective use of certain implanted devices. Because the revenue related to the immaterial non-contractual services is recognized before they are delivered, we forward accrue the costs to provide these services at the time the devices are sold. We record these costs to Selling, general and administrative expenses within our consolidated statements of operations. We estimate the amount of time spent by our representatives performing these services and their compensation throughout the device life to determine the service cost. Changes to our business practice or the use of alternative estimates could result in a different amount of accrued cost.