Collaboration and Licensing Agreements (Tables)

9 Months Ended

Sep. 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	(3,650)
Balance at September 30, 2021	$	527

	Deferred revenue - non-current
Balance at December 31, 2020	$	—
Increases to amounts invoiced for which cash has been received	2,947
Balance at September 30, 2021	$	2,947