Commitments and Contingencies Operating Leases We have two non-cancellable office leases with remaining lease terms of approximately 2.5 years, each of which are classified as operating leases. Only one of our leases has remaining renewal options, which includes three options to renew for one additional year. The exercise of lease renewal options is at our sole discretion, which we currently do not anticipate exercising and as such were not recognized as part of our ROU asset and lease liabilities. Our lease payments are fixed, and we recognize lease expense for these leases on a straight-line basis over the lease term. Operating lease ROU assets and lease liabilities are recorded based on the present value of the future minimum lease payments over the lease term at commencement date. As our leases do not provide an implicit rate, we used our incremental borrowing rate based on the information available at effective date of adoption in determining the present value of future payments. The weighted-average discount rate used was 8.59% . Our balance sheet includes our ROU assets and lease liabilities as follows (in thousands): Leases Classification on the Balance Sheet March 31, 2019 Operating ROU assets Other long-term assets $ 1,940 Operating lease liabilities Other current liabilities 794 Operating lease liabilities Other long-term liabilities 1,317 The following costs are included in our cash flow statement (in thousands): Leases Classification on the Cash Flow Three Months Ended March 31, 2019 Operating lease cost Operating $ 220 Cash paid for amounts included in the measurement of lease liabilities Operating 231 At March 31, 2019 , the future minimum annual obligations under non-cancellable operating lease commitments in excess of one year are as follows (in thousands): Years Ending December 31, 2019 $ 706 2020 968 2021 677 2022  2023  Thereafter  Total minimum payments required $ 2,351 Less imputed interest (240 ) Total $ 2,111 As previously disclosed in our 2018 Annual Report on Form 10-K, and under the previous lease accounting standard, future minimum annual obligations under non-cancellable operating lease commitments in excess of one year would have been as follows: Years Ending December 31, 2019 $ 937 2020 969 2021 726 2022  2023  Thereafter  Total minimum payments required $ 2,632