Deferred Revenue and Other Contract-Related Liabilities

Deferred revenue and other contract-related liabilities consist of the following (in thousands):



	March 31, 2018			December 30, 2017
Accrued customer reimbursements	$	17,648		$	16,896
Deferred revenue	12,385			11,589
Accrued rebates and incentives	4,407			3,598
Other contract-related liabilities	281			259
Total deferred revenue and other contract-related liabilities	34,721			32,342
Less: Non-current portion of deferred revenue	(212		)	(237		)
Deferred revenue and other contract-related liabilities - current	$	34,509		$	32,105

Deferred revenue relates to contracted amounts that have been invoiced to customers for which remaining performance obligations must be completed before the Company can recognize the revenue. These amounts primarily relate to undelivered equipment, sensors and services under long-term sensor purchase agreements, extended warranty agreements and NRE service agreements. Changes in deferred revenue for the three months ended March 31, 2018 were as follows:



	Three Months Ended March 31, 2018
Deferred revenue, beginning of the period	$	11,589
Revenue deferred during the period	2,873
Recognition of revenue deferred in prior periods	(2,077		)
Deferred revenue, end of the period	$	12,385

Expected revenue from remaining contractual performance obligations (Unrecognized Contract Revenue) includes deferred revenue, as well as other amounts that will be invoiced and recognized as revenue in future periods, when the Company completes its performance obligations. While Unrecognized Contract Revenue is similar in concept to backlog, Unrecognized Contract Revenue excludes revenue allocable to monitoring-related equipment that is effectively leased to hospitals under LT Sensor Contracts and other contractual obligations for which neither party has performed. The following table summarizes the Company’s estimated Unrecognized Contract Revenue as of March 31, 2018 and the future periods within which the Company expects to recognize such revenue. The estimated timing of this revenue is based, in part, on management’s estimates and assumptions about when its performance obligations will be completed. As a result, the actual timing of this revenue in future periods may vary, possibly materially, from those reflected in this table.



	Expected Future Revenue By Period (in thousands)
	Less than 1 year		Between 1-3 years		Between 3-5 years		More than 5 years		Total
Unrecognized Contract Revenue	$	179,650	$	241,482	$	92,674	$	15,412	$	529,218