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Deferred Revenue and Other Contract Liabilities
 9 Months Ended
Sep. 26, 2020
Revenue Recognition and Deferred Revenue [Abstract]  
Deferred Revenue and Other Contract Liabilities
13. Deferred Revenue and Other Contract Liabilities
Deferred revenue and other contract liabilities consist of the following (in thousands):
September 26,
2020		December 28,
2019
Deferred revenue$31,588 $13,998 
Accrued rebates and allowances11,389 8,436 
Accrued customer reimbursements5,294 5,739 
     Total deferred revenue and other contract liabilities48,271 28,173 
Less: Non-current portion of deferred revenue(3,729)(2,234)
     Deferred revenue and other contract liabilities - current$44,542 $25,939 
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 deferred equipment agreements, extended warranty agreements and maintenance agreements.
Changes in deferred revenue were as follows (in thousands):
Nine Months Ended
September 26,
2020
Deferred revenue, beginning of the period$13,998 
  Increase from business combinations10,064 
  Revenue deferred during the period20,058 
  Recognition of revenue deferred in prior periods(12,532)
     Deferred revenue, end of the period$31,588 
During the three months ended March 28, 2020, the Company completed an immaterial business combination. Based on the Company’s preliminary purchase price allocation for this transaction, approximately $9.5 million of the purchase price was assigned to deferred revenue.
During the three months ended June 27, 2020, the Company completed another immaterial business combination. Based on the Company’s preliminary purchase price allocation for this transaction, approximately $0.6 million of the purchase price was assigned to deferred revenue. The Company is still gathering additional information to finalize these preliminary estimates and expects to finalize the purchase price allocations as soon as practicable, but no later than one year from the acquisition dates.
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 customers under deferred equipment agreements and other contractual obligations for which neither party has performed.
The following table summarizes the Company’s estimated Unrecognized Contract Revenue as of September 26, 2020 and the future periods within which the Company expects to recognize such revenue.
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$222,527 $359,136 $166,490 $34,935 $783,088 
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.