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Deferred Revenue | 12 Months Ended
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Dec. 31, 2021
Revenue From Contract With Customer [Abstract] |
Deferred Revenue |
9. | Deferred Revenue
Deferred revenue by revenue classification as of December 31, 2021 and 2020 was as follows (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Current deferred revenue |  |  |  |  |  |  |  |
Sequencing |  | $ | 21,915 |  |  | $ | 15,463 |
Development |  |  | 58,545 |  |  |  | 57,856 |
Total current deferred revenue |  |  | 80,460 |  |  |  | 73,319 |
Non-current deferred revenue |  |  |  |  |  |  |  |
Sequencing |  |  | 174 |  |  |  | 724 |
Development |  |  | 98,576 |  |  |  | 162,894 |
Total non-current deferred revenue |  |  | 98,750 |  |  |  | 163,618 |
Total current and non-current deferred revenue |  | $ | 179,210 |  |  | $ | 236,937 |
Deferred revenue from our Genentech Agreement represents $56.1 million and $94.0 million of the current and non-current development deferred revenue balances, respectively, as of December 31, 2021 and $55.1 million and $157.0 million of the current and non-current development deferred revenue balances, respectively, as of December 31, 2020. In general, we expect that the current amounts will be recognized as revenue within 12 months and the non-current amounts will be recognized as revenue over a period of approximately five to six years from December 31, 2021. This period of time represents an estimate of the research and development period to develop cellular therapies in oncology, which may be reduced or increased based on the various development activities. During the year ended December 31, 2021, we recognized $3.6 million in revenue as a result of changes in estimates of total samples to be provided under certain of our agreements and cancelled biopharmaceutical customer sequencing contracts for which we had received upfront consideration. Additionally, we recognized $2.5 million of sequencing revenue during the year ended December 31, 2021 related to Medicare reimbursements resulting from our determination that the likelihood of additional testing for specific patients was remote and a change in our estimate of expected cumulative tests per patient for one of our covered indications. Changes in deferred revenue during the year ended December 31, 2021 were as follows (in thousands):
Deferred revenue balance at December 31, 2020 |  | $ | 236,937 |
Additions to deferred revenue during the period |  |  | 38,062 |
Revenue recognized during the period |  |  | (95,789 | )
Deferred revenue balance at December 31, 2021 |  | $ | 179,210 |
As of December 3 1, 20 2 1, $75.7 million was recognized as revenue that was included in the deferred revenue balance at December 31, 20 20.

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