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Collaboration and Licensing Agreements (Tables)

6 Months Ended

Jun. 30, 2021

Collaboration and Licensing Agreements

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