11. Commitments and Contingencies Operating Leases The Company leases office space under operating lease agreements that expire at various dates beginning in 2021 and extend through 2025 in several locations within the United States including its headquarters, which is located in Raleigh, NC. On January 1, 2019, the Company entered into an amendment to an office building lease relating to 117,719 square feet of office space, which includes the Companys headquarters. The amendment provides an additional 30,114 square feet to the previous 87,605 square feet and extends the lease term to January 31, 2024. In addition, this amendment gives the Company the option to extend the lease for an additional five -year term. The amendment to the office building lease commenced in April 2019. On May 29, 2019, the Company further amended the lease to provide an additional 2,322 square feet for a total of 120,041 square feet of office space. This amendment commenced in June 2019. On April 4, 2019, the Company entered into an amendment to an office building lease relating to 9,408 square feet of office space. The amendment provides an additional 5,286 square feet to the previous 4,122 square feet and extends the lease term to September 30, 2024. In addition, this amendment gives the Company the option to extend the lease for an additional five -year term. The amendment to the office building lease commenced in July 2019. The leases contain escalation clauses and various landlord concessions, including a tenant improvement allowance. The Company recognizes the total minimum lease payments on a straight-line basis over the term of the lease. Future minimum lease payments required under operating leases are as follows: As of June 30, 2019 2019 (remaining) $ 3,078 2020 6,430 2021 6,587 2022 6,301 2023 5,926 Thereafter 2,936 $ 31,258 The Company incurred rent expense of $1,022 and $1,955 for the three and six months ended June 30, 2018, respectively, and $1,434 and $2,653 for the three and six months ended June 30, 2019, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. On January 1, 2019, the Company entered into an amendment to an office building lease relating to 40,657 square feet of office space, which the Company sub-leases to a related party, Republic Wireless, Inc. (Republic). The amendment gives the Company the options to extend the lease for an additional period of approximately 18 months and a subsequent additional five -year term. The amendment to the office building lease commenced in January 2019. On May 29, 2019, the Company further amended the sub-lease to reduce the square feet of office space sub-leased to 17,073. No other terms were amended. The amendment to the office building sub-lease commenced in June 2019. The Company recorded a reduction of rent expense of $251 and $502 related to the sublease agreement for the three and six months ended June 30, 2018, respectively, and $200 and $451 for the three and six months ended June 30, 2019, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. Future minimum sub-lease receipts required under the non-cancellable lease are as follows: As of June 30, 2019 2019 (remaining) $ 221 2020 447 2021 457 2022 249 $ 1,374 Contractual Obligations On October 25, 2015, the Company entered into an agreement with a telecommunications service provider. The service agreement requires the Company to pay a monthly recurring charge beginning on January 1, 2016 associated with the services received. The service agreement is non-cancellable and contains annual minimum commitments of $1,200, to be fulfilled over five years or for as long as the Company continues to receive services from this vendor. In addition, as of June 30, 2019 the Company has $4,789 in other non-cancellable purchase obligations, consisting of primarily network equipment maintenance and software license contracts, of which $4,098 will be fulfilled within a year. Legal Matters The Company is involved as a defendant in various lawsuits alleging that the Company failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services pursuant to applicable laws in various jurisdictions. In August 2016, the Company received a Civil Investigative Demand from the Consumer Protection Division of the North Carolina Department of Justice, though the Company has not been served with a complaint in connection with that investigation. The North Carolina Department of Justice is investigating the billing, collection and remission of certain taxes and surcharges associated with 911 service pursuant to applicable laws of the State of North Carolina. While the results of these legal proceedings cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on the Companys financial position or results of operations.