COMMITMENTS AND CONTINGENCIES Operating Leases We lease property and equipment under non-cancellable operating leases which, in the aggregate, extend through 2025. Many of these leases contain renewal options and provide for rent escalations and payment of real estate taxes, maintenance, insurance and certain other operating expenses of the properties. Rent expense under all operating leases was as follows (in thousands): Year Ended December 31, 2018 2017 2016 Rent expense $ 5,199 $ 6,095 $ 6,561 As of December 31, 2018 , future minimum lease payments under non-cancellable leases, net of sublease income, were as follows (in thousands): 2019 $ 5,366 2020 5,279 2021 4,147 2022 2,729 2023 1,698 Thereafter 2,647 $ 21,866 Guarantees, Commitments and Off-Balance Sheet Arrangements We have long lead times for inventory purchases and, therefore, must secure factory capacity from our vendors in advance. As of December 31, 2018 , we had approximately $27.2 million in non-cancelable market-based purchase obligations, primarily for inventory purchases expected to be received within the next twelve months. Purchase obligations can vary from quarter-to-quarter and versus the same period in prior years due to a number of factors, including the amount of products that are shipped directly to Retail customer warehouses versus through Nautilus warehouses. As of December 31, 2018 , we had no outstanding letters of credit with any of our vendors. In the ordinary course of business, we enter into agreements that require us to indemnify counterparties against third-party claims. These may include: agreements with vendors and suppliers, under which we may indemnify them against claims arising from use of their products or services; agreements with customers, under which we may indemnify them against claims arising from their use or sale of our products; real estate and equipment leases, under which we may indemnify lessors against third-party claims relating to the use of their property; agreements with licensees or licensors, under which we may indemnify the licensee or licensor against claims arising from their use of our intellectual property or our use of their intellectual property; and agreements with parties to debt arrangements, under which we may indemnify them against claims relating to their participation in the transactions. The nature and terms of these indemnification obligations vary from contract to contract, and generally a maximum obligation is not stated within the agreements. We hold insurance policies that mitigate potential losses arising from certain types of indemnification obligations. Management does not deem these obligations to be significant to our financial position, results of operations or cash flows and, therefore, no related liabilities were recorded as of December 31, 2018 . Legal Matters From time to time, in the ordinary course of business, we may be involved in various claims, lawsuits and other proceedings. These legal proceedings involve uncertainty as to the eventual outcomes and losses which may be realized when one or more future events occur or fail to occur. Litigation and jury verdicts are, to some degree, inherently unpredictable, and although we have determined that a loss is not probable in connection with any current legal proceeding, it is reasonably possible that a loss may be incurred in connection with proceedings to which we are a party. Assessment of whether incurrence of a loss is probable, or a reasonable possibility, in connection with a particular proceeding, and estimation of the loss, or a range of loss, involves complex judgments and numerous uncertainties. Management is unable to estimate a range of reasonably possible losses related to litigation in which the damages sought are indeterminate, or the legal and factual basis for the relevant claims have not been developed with specificity. As such, zero liability is recorded as of December 31, 2018 . We regularly monitor our estimated exposure to these contingencies and, as additional information becomes known, may change our estimates accordingly. We evaluate, on a quarterly basis, developments in legal proceedings, investigations or claims that could affect the amount of any accrual, as well as any developments that would make a loss probable or reasonably possible, and whether the amount of a probable or reasonably possible loss is estimable. Among other factors, we evaluate the advice of internal and external counsel, the outcomes from similar litigation, current status of the lawsuits (including settlement initiatives), legislative developments and other factors. Due to the numerous variables associated with these judgments and assumptions, both the precision and reliability of the resulting estimates of the related loss contingencies are subject to substantial uncertainties. As of the date of filing of this Annual Report on Form 10-K, we were not involved in any material legal proceedings.