NOTE 14. COMMITMENTS AND CONTINGENCIES Leases As of March 31, 2017, our contractual obligations for our operating lease obligations for succeeding years are as follows (in thousands): Payments Due by Period Due in Fiscal Total 2018 2019 2020 2021 2022 Thereafter Operating lease obligations $ 25,375 $ 2,694 $ 2,704 $ 2,643 $ 2,673 $ 2,836 $ 11,825 Our operating lease obligations comprised our principal facility and various leased facilities and equipment under operating lease agreements, which expire on various dates from fiscal 2018 through fiscal 2026. Our principal facilities located in Union City, California is under a non-cancelable operating lease agreement, which expires in fiscal 2026. The monthly rental payments on principal facilities lease increase based on a predetermined schedule and accordingly, we recognize rent expense on a straight-line basis over the life of the lease. Rent expense from continuing operations under operating leases was $2.9 million, $2.3 million and $2.0 million for fiscal 2017, 2016 and 2015, respectively. Rent expense from discontinued operations under operating leases was $12,000, $0, and $0.2 million for fiscal 2017, 2016 and 2015, respectively. Commitments We have purchase commitments, consisting of supply and inventory related agreements, totaling approximately $5.6 million as of March 31, 2017. These purchase order commitments primarily include our purchase obligations to purchase from Diatron of Hungary through fiscal 2018. See Note 7, Investments in Unconsolidated Affiliates for information on commitments due in connection with our investment in a privately-held company. See Note 24, Subsequent Events for information on commitments due in connection with a joint development agreement with the diagnostics division of a medical products company that we entered into after March 31, 2017. Litigation We are involved from time to time in various litigation matters in the normal course of business. There can be no assurance that existing or future legal proceedings arising i