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Revenue | 12 Months Ended
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Sep. 30, 2021
Revenue From Contract With Customer [Abstract] |
Revenue | 3. Revenue The following table presents the Company’s revenues disaggregated by product classification and by reportable segment:
|  | Fiscal Year |
(In thousands) |  | 2021 |  |  | 2020 |  |  | 2019 |
Medical Device |  |  |  |  |  |  |  |  |  |  |  |
Product sales |  | $ | 21,777 |  |  | $ | 21,608 |  |  | $ | 18,617 |
Royalties |  |  | 30,781 |  |  |  | 28,614 |  |  |  | 34,781 |
License fees |  |  | 16,275 |  |  |  | 12,020 |  |  |  | 13,678 |
Research, development and other |  |  | 9,420 |  |  |  | 9,159 |  |  |  | 11,277 |
Medical Device Revenue |  |  | 78,253 |  |  |  | 71,401 |  |  |  | 78,353 |
In Vitro Diagnostics |  |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  | 24,701 |  |  |  | 22,709 |  |  |  | 21,390 |
Other |  |  | 2,182 |  |  |  | 754 |  |  |  | 334 |
In Vitro Diagnostics Revenue |  |  | 26,883 |  |  |  | 23,463 |  |  |  | 21,724 |
Total Revenue |  | $ | 105,136 |  |  | $ | 94,864 |  |  | $ | 100,077 |
Contract assets totaled $7.1 million and $6.1 million as of September 30, 2021 and 2020, respectively. Fluctuations in the balance of contract assets result primarily from changes in sales-based and minimum royalties earned, but not collected at each balance sheet date due to payment timing and contractual changes in the normal course of business. For discussion of contract liability (deferred revenue) balances and remaining performance obligations, see Note 4 Collaborative Arrangement. Revenue from customers that equaled or exceeded 10% of total revenue was as follows:
|  | Fiscal Year |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Abbott |  |  | 21 | % |  |  | 19 | % |  |  | 19 | %
Medtronic |  |  | 13 | % |  |  | 14 | % |  |  | 14 | %

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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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&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=123351226&loc=SL49130554-203045 + Details
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