Collaboration and Licensing Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Deferred revenue - current
Beginning balance	$ 4,211
Ending balance	5,959
Deferred revenue - non-current
Beginning balance	9,025
Ending balance	9,238
2017 KKC Agreement
Deferred revenue - current
Beginning balance	4,211	$ 0
Increases due to cash received, excluding amounts recognized as revenue during the period	816	0
Increases due to amounts reclassified from non-current, to be recognized in the next twelve months	3,265
Decreases due to revenue recognized in the period for which cash has not been received	(2,333)	0
Ending balance	5,959	0
Deferred revenue - non-current
Beginning balance	9,025	4,727
Increases due to cash received during the period	3,478	3,829
Increases to amounts invoiced, for which cash has not yet been received	0	3,865
Decreases due to amounts reclassified as current, to be recognized in the next twelve months	(3,265)	0
Ending balance	$ 9,238	$ 12,421