Commitments and Contingencies Commitments Material Contracts The Company has two license agreements with the Regents of the University of California to maintain exclusive rights to patents. The Company is required to pay 1% of net sales of licensed medical devices sold to entities other than the U.S. government. In addition, the Company is required to pay 21% of consideration collected from any sublicensee for the grant of the sublicense. In connection with acquisition of Equipois, the Company assumed the rights and obligations of Equipois under a license agreement with the developer of certain intellectual property related to mechanical balance and support arm technologies, which grants the Company an exclusive license with respect to the technology and patent rights for certain fields of use. Pursuant to the terms of the license agreement, the Company is required to pay the developer a single-digit royalty on net receipts, subject to a $50 annual minimum royalty requirement. Purchase Obligations The Company purchases components from a variety of suppliers and use contract manufacturers to provide manufacturing services for its products. Purchase obligations are defined as agreements that are enforceable and legally binding and that specify all significant terms, including fixed or minimum quantities to be purchased; fixed, minimum or variable price provisions; and the approximate timing of the transaction. The Company had purchase obligations primarily for purchases of inventory and manufacturing related service contracts totaling $1,459 as of December 31, 2018 , which is expected to be paid within a year. Timing of payments and actual amounts paid may be different depending on the time of receipt of goods or services or changes to agreed-upon amounts for some obligations. Other Contractual Obligations The following table summarizes our outstanding contractual obligations, including interest payments, as of December 31, 2018 and the effect those obligations are expected to have on our liquidity and cash flows in future periods: Payments Due By Period Total Less than one year 1-3 Years 3-5 Years Term loan $ 5,521 $ 2,632 $ 2,889 $  Facility operating lease 1,923 541 1,382  Capital lease 59 37 22  Total $ 7,503 $ 3,210 $ 4,293 $  Contingencies In the normal course of business, the Company is subject to various legal matters. In the opinion of management, the resolution of such matters will not have a material adverse effect on the Companys consolidated financial statements.