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Organization and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Jan. 01, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Concentration Risks | As of December 31, 2020 and 2019, the percentage of trade receivables by customer who individually accounted for 10% or more of our trade receivables were as follows:
| December 31,
| 2020 |  | 2019
Collaboration partners |  |  |
Ipsen | 23 | % |  | 38 | %
Takeda | 10 | % |  | 2 | %
Product revenue customers |  |  |
Affiliates of McKesson Corporation | 12 | % |  | 14 | %
Affiliates of CVS Health Corporation | 11 | % |  | 10 | %
Affiliates of AmerisourceBergen Corporation | 11 | % |  | 11 | %
Affiliates of Optum Specialty Pharmacy | 8 | % |  | 10 | %
The percentage of total revenues by customer who individually accounted for 10% or more of our total revenues were as follows:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Ipsen | 15 | % |  | 16 | % |  | 21 | %
Affiliates of CVS Health Corporation | 14 | % |  | 15 | % |  | 13 | %
Affiliates of McKesson Corporation | 12 | % |  | 12 | % |  | 12 | %
Affiliates of Optum Specialty Pharmacy | 11 | % |  | 13 | % |  | 14 | %
Affiliates of AmerisourceBergen Corporation | 11 | % |  | 11 | % |  | 9 | %

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13537-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6442-108592 + Details
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