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Collaboration and Licensing Agreements (Tables) | 6 Months Ended
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Jun. 30, 2021
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 current deferred revenue balance is attributable entirely to the 2019 KKC Agreement and the non-current deferred revenue balance is attributable entirely to the 2017 KKC Agreement (in thousands):
| Deferred revenue - current
Balance at December 31, 2020 | $ | 4,177 |
Decreases due to revenue recognized in the period for which cash has been received | (2,765) |
Balance at June 30, 2021 | $ | 1,412 |
| Deferred revenue - non-current
Balance at December 31, 2020 | $ | — |
Increases to amounts invoiced for which cash has been received | 2,947 |
Balance at June 30, 2021 | $ | 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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