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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2018
Disaggregation of Revenue | Revenues for the years ended December 31, 2018, 2017 and 2016 were as follows (amounts in thousands, except percentages):
|  | For the Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (Amounts in thousands) |
Product Revenue |  | $ | 193,891 |  |  | $ | 141,089 |  |  | $ | 104,441 |
Royalty and other income |  |  | 141 |  |  |  | 147 |  |  |  | 100 |
Total revenue |  | $ | 194,032 |  |  | $ | 141,236 |  |  | $ | 104,541 |
Revenue from Significant Customers | Revenue from significant customers is as follows (amounts in thousands):
|  | For the Years Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
MilliporeSigma |  | $ | 29,843 |  |  | $ | 25,061 |  |  | $ | 28,856 |
GE Healthcare |  | $ | 29,616 |  |  | $ | 30,150 |  |  | $ | 30,366 |
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, 2018 (amounts in thousands):
|  | 2018 |
Balances from contracts with customers only: |  |  |  |
Accounts receivable |  | $ | 33,015 |
Deferred revenue |  |  | 1,290 |
Revenue recognized during the three-month period ending December 31, 2018 relating to: |  |  |  |
The beginning deferred revenue balance |  | $ | 422 |
Changes in pricing related to products or services satisfied in previous periods |  |  | — |

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