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Deferred Revenue and Other Contract Liabilities | 9 Months Ended
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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 allowances | 11,389 |  |  | 8,436 |
Accrued customer reimbursements | 5,294 |  |  | 5,739 |
Total deferred revenue and other contract liabilities | 48,271 |  |  | 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 combinations | 10,064 |
Revenue deferred during the period | 20,058 |
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, approximate ly $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.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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