We license proprietary products and protocols to customers under licensing agreements that allow those customers to utilize the products and protocols in services they provide to their customers. The timing and amount of revenue recognized from license agreements depends upon a variety of factors, including the specific terms of each agreement. Such agreements are reviewed for multiple performance obligations. Performance obligations can include amounts related to initial non-refundable license fees for the use of our products and protocols and additional royalties on covered services.

The Company granted license and sub-license agreements for various regions or States in the United States allowing the licensee to market, distribute and sell solely in the defined license territory, as defined, the products provided by the Company. The agreements are granted for a defined period or perpetual and are effective as long as annual milestones are achieved.

Terms for payments for licensee agreements vary from full cash payment to defined terms. In cases where license or sub-license fees are uncollected or deferred; the Company nets those uncollected fees with the deferred revenue for balance sheet presentation.

The Company amortizes license fees over the shorter of the economic life of the related contract life or contract terms for each licensee.

The following table presents the changes in deferred revenue, reflected as current and long term liabilities on the Company’s consolidated balance sheet:

The Company granted license and sub-license agreements for various regions or States in the United States allowing the licensee to market, distribute and sell solely in the defined license territory, as defined, the products provided by the Company. The agreements are granted for a defined period or perpetual and are effective as long as annual milestones are achieved.

Terms for payments for licensee agreements vary from full cash payment to defined terms. In cases where license or sub-license fees are uncollected or deferred; the Company nets those uncollected fees with the deferred revenue for balance sheet presentation.

The Company amortizes license fees over the shorter of the economic life of the related contract life or contract terms for each licensee. The remaining unamortized aggregate balance of deferred revenue as of December 31, 2017 and 2016 was $638,693 and $1,046,264, respectively.