As of December 31, 2017, the Company’s material contractual obligations are as follows (in thousands):



	Total		2018		2019		2020		2021		2022		Thereafter
Contractual obligations (1)
Imputed financing obligation (2)	$	15,918	$	6,447	$	6,602	$	2,869	$	—	$	—	$	—
Leases and other contractual obligations	26,225		6,757		5,678		4,705		4,839		3,381		865
Software licenses (3)	13,982		10,450		3,532		—		—		—		—
Convertible notes	253,707		81,207		—		—		—		—		172,500
Interest payments related to convertible notes	13,443		2,763		2,372		2,372		2,372		2,372		1,192
Total	$	323,275	$	107,624	$	18,184	$	9,946	$	7,211	$	5,753	$	174,557

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(1)

The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $22.6 million including $20.4 million recorded as a reduction of long-term deferred tax assets and $2.2 million in long-term income taxes payable, as of December 31, 2017. As noted below in Note 16, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.

(2)

With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the Consolidated Balance Sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. The amount includes the amended Ohio lease and the amended Sunnyvale lease.


(3)	The Company has commitments with various software vendors for agreements generally having terms longer than one year.