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Collaboration and Licensing Agreements (Tables) | 3 Months Ended
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Mar. 31, 2022
Collaboration and Licensing Agreements |
Schedule of Changes in Deferred Revenue | The following tables present changes in our current and non-current deferred revenue balances during the reporting period. The March 31, 2021 current deferred revenue balance is attributable entirely to the 2019 KKC Agreement and the non-current deferred revenue balances at March 31, 2022 and 2021 are attributable entirely to the 2017 KKC Agreement (in thousands):
Deferred revenue - current | 2022 |  | 2021
Balance at January 1, | $ | — |  |  | $ | 4,177 |
Decreases due to revenue recognized in the period for which cash has been received | — |  |  | (1,454) |
Balance at March 31, | $ | — |  |  | $ | 2,723 |
Deferred revenue - non-current | 2022 |  | 2021
Balance at January 1, | $ | 4,727 |  |  | $ | — |
Increases to amounts invoiced, for which cash has not yet been received | 3,829 |  |  | 2,947 |
Increase due to unbilled prepayments recorded during the period | 7 |  |  | — |
Balance at March 31, | $ | 8,563 |  |  | $ | 2,947 |

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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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