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Collaboration and Licensing Agreements (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2022 deferred revenue balance is attributable entirely to the 2017 KKC Agreement, while the current September 30, 2021 deferred revenue balance is attributable to the 2019 KKC Agreement and the non-current September 30, 2021 deferred revenue balance is attributable to the 2017 KKC Agreement (in thousands):
Deferred revenue - current20222021
Balance at January 1,$— $4,177 
Increases due to amounts reclassified from non-current, to be recognized in the next twelve months3,961 
Increases to amounts invoiced, for which cash has not yet been received42 — 
Decreases due to revenue recognized in the period for which cash has been received— (3,650)
Balance at September 30,$4,003 $527 

Deferred revenue - non-current20222021
Balance at January 1,$4,727 $— 
Increases due to cash received during the period7,694 2,947 
Increases to amounts invoiced, for which cash has not yet been received100 — 
Decreases due to amounts reclassified as current, to be recognized in the next twelve months(3,961)— 
Balance at September 30,$8,560 $2,947