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Collaboration and Licensing Agreements (Tables)
 3 Months Ended
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 - current20222021
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-current20222021
Balance at January 1,$4,727 $— 
Increases to amounts invoiced, for which cash has not yet been received3,829 2,947 
Increase due to unbilled prepayments recorded during the period7 — 
Balance at March 31,$8,563 $2,947