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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2019
Disaggregation of Revenue | Revenue for the years ended December 31, 2019, 2018 and 2017 was as follows (amounts in thousands, except percentages):
|  | For the Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
|  | (Amounts in thousands) |
Product r evenue |  | $ | 270,097 |  |  | $ | 193,891 |  |  | $ | 141,089 |
Royalty and other income |  |  | 148 |  |  |  | 141 |  |  |  | 147 |
Total revenue |  | $ | 270,245 |  |  | $ | 194,032 |  |  | $ | 141,236 |
Revenue from Significant Customers | Revenue from significant customers is as follows (amounts in thousands):
|  | For the Years Ended December 31, |
|  | 2019 |  |  | 2018 |  |  | 2017 |
MilliporeSigma |  | $ | 36,190 |  |  | $ | 29,843 |  |  | $ | 25,061 |
GE Healthcare |  | $ | 31,441 |  |  | $ | 29,616 |  |  | $ | 30,150 |
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, 2019 (amounts in thousands):
|  | 2019 |
Balances from contracts with customers only: |  |  |  |
Accounts receivable |  | $ | 43,068 |
Deferred revenue (included in accrued liabilities in the consolidated balance sheets) |  |  | 5,005 |
Revenue recognized during 2019 relating to: |  |  |  |
The beginning deferred revenue balance |  | $ | 833 |
Changes in pricing related to products or services satisfied in previous periods |  |  | — |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + 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=118956577&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=118956577&loc=SL49130545-203045 + Details
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