15. Commitments and Contingencies

Leases

        The Company rents office space under leases that expire at various dates through 2026. In 2013, the Company exercised its right to early terminate the Denver and Raleigh office leases in accordance with the provisions of the leases. The total termination fees were $1,142, of which approximately $551 was paid during 2013. The remainder of the fee was paid in 2014. During the year ended December 31, 2013, the Company recorded $474 (see Note 9) of restructuring charges, net of deferred rent adjustment, in the consolidated statement of operations related to these lease termination fees.

        Future annual minimum lease commitments under operating leases were as follows:

        Rent expense for all operating leases totaled:

Purchase Obligations and Indemnifications

        The Company includes various types of indemnification and guarantee clauses in certain arrangements. These indemnifications and guarantees may include, but are not limited to, infringement claims related to intellectual property, direct or consequential damages and guarantees to certain service providers and service level requirements with certain customers. The type and amount of any potential indemnification or guarantee varies substantially based on the nature of each arrangement. The Company has experienced no previous claims and cannot determine the maximum amount of potential future payments, if any, related to such indemnification and guarantee provisions. The Company believes that it is unlikely it will have to make material payments under these arrangements and therefore has not recorded a contingent liability in the consolidated balance sheets.

        The Company enters into unconditional purchase obligations arrangements for certain of its services that it receives in the normal course of business. As of December 31, 2014, estimated future minimum unconditional purchase obligations are $3,688.  

Litigation

        The Company is involved in litigation arising in the ordinary course of its business. The Company does not believe that the outcome of any of these proceedings, individually or in the aggregate, would, if determined adversely to it, have a material adverse effect on its results of operations, financial condition, cash flows or business.