15. Commitments and Contingencies Purchase Commitments The Company periodically enters into non-cancelable purchase contracts in order to ensure the availability of materials to support production of its products. Purchase commitments represent enforceable and legally binding agreements with suppliers to purchase goods or services. The Company periodically assesses the need to provide for impairment on these purchase contracts and record a loss on purchase commitments when required. Lease Commitments Operating leases include minimum payments under leases for the Companys facilities and certain equipment. The Companys primary leased facilities are located in Klagenfurt, Austria; Suzhou, China; Ayer, Massachusetts; Timisoara, Romania; and Pewaukee, Wisconsin; with a combined total of approximately 187,000 square feet of space. These leases have varying expiration dates through November 2022 which can generally be terminated at the Companys request after a six month advance notice. The Company leases other locations which focus primarily on applications engineering, sales and/or field service and do not have significant leases or physical presence. See Item 2, Properties for further information. Minimum future lease commitments at March 31, 2019 were as follows (in thousands): Fiscal years ended March 31, Total 2020 $ 1,121 2021 894 2022 648 2023 416 2024 65 Total $ 3,144 Rent expense under the operating leases mentioned above was as follows (in thousands): Fiscal years ended March 31, 2019 2018 Rent expense $ 1,286 $ 1,510 Legal Contingencies From time to time, the Company is involved in legal and administrative proceedings and claims of various types. The Company records a liability in its consolidated financial statements for these matters when a loss is known or considered probable and the amount can be reasonably estimated. The Company reviews these estimates each accounting period as additional information is known and adjusts the loss provision when appropriate. If a matter is both probable to result in a liability and the amounts of loss can be reasonably estimated, the Company estimates and discloses the possible loss or range of loss to the extent necessary to make the consolidated financial statements not misleading. If the loss is not probable or cannot be reasonably estimated, a liability is not recorded in its consolidated financial statements. Other The Company enters into long-term construction contracts with customers that require the Company to obtain performance bonds. The Company is required to deposit an amount equivalent to some or all the face amount of the performance bonds into an escrow account until the termination of the bond. When the performance conditions are met, amounts deposited as collateral for the performance bonds are returned to the Company. In addition, the Company has various contractual arrangements in which minimum quantities of goods or services have been committed to be purchased on an annual basis. As of March 31, 2019, the Company had $0.7 million of restricted cash included in long-term assets. These amounts included in restricted cash primarily represent deposits to secure letters of credit for various supply contracts. These deposits are held in interest bearing accounts.