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Collaboration and Licensing Agreements (Tables) | 12 Months Ended
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Dec. 31, 2021
Collaboration and Licensing Agreements [Abstract] |
Schedule of Cost of Revenue Recognized and Paid | To date in aggregate, we have recognized $11.6 million of the $75.0 million, recorded as cost of revenue, as follows (in thousands):
| Cost of Revenue
| Recognized |  | Amount Paid
Year 2017 | $ | 9,400 |  | * | $ | 6,000 |
Year 2018 | 466 |  |  | 2,864 |
Year 2019 | 600 |  |  | 1,002 |
Year 2020 | 145 |  |  | 742 |
Year 2021 | 1,000 |  |  | 1,003 |
Total | $ | 11,611 |  |  | $ | 11,611 |
Maximum payment per termination agreement |  |  | 75,000 |
Remaining potential commitment |  |  | $ | 63,389 |
* Includes $1.0 million adjustment recorded pursuant to the adoption of ASC 606, as discussed in Note 2.
Schedule of Deferred Revenue Balances | 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 | 2021 |  | 2020
Balance at Balance at January 1, | $ | 4,177 |  |  | $ | 4,541 |
Decreases due to revenue recognized in the period for which cash has been received | (4,177) |  |  | (364) |
Balance at Balance at December 31, | $ | — |  |  | $ | 4,177 |
Deferred revenue - non-current | 2021 |  | 2020
Balance at Balance at January 1, | $ | — |  |  | $ | — |
Increases due to cash received during the period | 3,242 |  |  | — |
Increase due to unbilled prepayments recorded during the period | 1,485 |  |  | — |
Balance at Balance at December 31, | $ | 4,727 |  |  | $ | — |

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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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