Operating Leases. The facilities of the Company are leased under various operating lease agreements for periods ending no later than 2024. The Company also leases motor vehicles under various operating leases, which expire on various dates, the latest of which is in 2021.

Future minimum lease payments under non-cancelable operating leases as of December 31, 2018, are as follows:

2019	$	3,807
2020		3,053
2021		2,549
2022		2,282
2023		1,530
Thereafter		323
	$	13,544

Lease and rental expense for the years ended December 31, 2018, 2017 and 2016 was $4,033, $3,474, and $2,748, respectively.

As of December 31, 2018 and 2017 the Company pledged bank deposits of $1,143 and $1,038, respectively, to cover bank guarantees in respect of its leases of operating facilities and obtained guarantees by the bank for the fulfillment of the Company’s lease commitments of $1,299 and $1,202, respectively.

In the first quarter of 2018, the Company made the final milestone payment of $5.5 million (the “Milestone Payment”) to the Technion Research and Development Foundation (“Technion”) pursuant to the settlement agreement dated February 10, 2015 (the “Settlement Agreement”). Pursuant to the Settlement Agreement, and in exchange for a release of potential disputes regarding intellectual property developed by our founder and previously assigned to us, the Company was obligated to pay the Milestone Payment to Technion in the quarter following the quarter in which the Company achieved $250.0 million of cumulative net sales (as defined in the Settlement Agreement) (the “Net Sales Milestone”). The Company met the Net Sales Milestone in the fourth quarter of 2017.

On September 10, 2018, the Company entered into a License and Collaboration Agreement (the “Zai Agreement”) with Zai Lab (Shanghai) Co., Ltd. (“Zai”). Under the Zai Agreement, the Company granted Zai exclusive rights to commercialize Optune in the field of oncology in China, Hong Kong, Macau and Taiwan (“Greater China”). The Zai Agreement also established a development partnership for Optune in multiple solid tumor indications. In partial consideration for the license grant to Zai for Greater China, the Company was entitled to a non-refundable, up-front license fee in the amount of $15 million (the “License Fee”). The Agreement also provides for certain development, regulatory and commercial milestone payments totaling up to $78 million. Furthermore, pursuant to the Agreement Zai will pay the Company tiered royalties at percentage rates from 10 up to the mid-teens on the net sales of the licensed products in Greater China. Zai is purchasing licensed products for commercial use exclusively from the Company at the Company’s fully burdened manufacturing cost.

The Company recognizes revenue pursuant to the License Agreement with Zai in accordance with ASC 606, "Revenue Recognition from Customers". The License Fee, net of withholding taxes, is deferred and recognized over related six year performance period. The License Fee will be recognized on a straight-line basis, resulting in revenue of $767 for the year ended December 31, 2018. The deferred portion of the License Fee is presented in the balance sheet as deferred revenues, under Other Payables and Accrued Expenses and Long-term Liabilities, respectively. Revenue from any future milestone payments will be recognized upon the achievement of such milestones, in accordance with ASC 606, “Gain Contingencies". Revenue from any future royalty payments will be recognized in accordance with ASC 606.