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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2021
Disaggregation of Revenue | Revenue for the years ended December 31, 2021, 2020 and 2019 was as follows:
|  | For the Years Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
|  | (Amounts in thousands) |
Product revenue |  | $ | 670,319 |  |  | $ | 366,136 |  |  | $ | 270,097 |
Royalty and other income |  |  | 215 |  |  |  | 124 |  |  |  | 148 |
Total revenue |  | $ | 670,534 |  |  | $ | 366,260 |  |  | $ | 270,245 |
Revenue from Significant Customers | Revenue from significant customers that represent 10% or more of the Company’s total revenue is as follows (amounts in thousands):
|  | For the Years Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Pfizer Inc. |  | $ | 68,273 |  |  | N/A |  |  | N/A |
MilliporeSigma |  | N/A |  |  | $ | 39,511 |  |  | $ | 36,190 |
Cytiva |  | N/A |  |  | N/A |  |  | $ | 31,441 |
Summary of Receivables and Deferred Revenue from Contracts with Customers | The following table provides information about receivables and deferred revenue from contracts with customers as of December 31, 2021 (amounts in thousands):
|  | 2021 |  |  | 2020 |
Balances from contracts with customers only: |  |  |  |  |  |
Accounts receivable |  | $ | 117,420 |  |  | $ | 71,257 |
Deferred revenue (included in accrued liabilities in the consolidated balance sheets) |  | $ | 14,848 |  |  | $ | 15,318 |
Revenue recognized during years presented relating to: |  |  |  |  |  |
The beginning deferred revenue balance |  | $ | 13,708 |  |  | $ | 3,361 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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