Collaboration and Licensing Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Deferred revenue - current
Beginning balance	$ 4,211
Ending balance	5,545
Deferred revenue - non-current
Beginning balance	9,025
Ending balance	11,498
2017 KKC Agreement
Deferred revenue - current
Beginning balance	4,211	$ 0
Increases due to amounts reclassified from non-current, to be recognized in the next twelve months	809
Increases to amounts invoiced, for which cash has not yet been received	525	0
Ending balance	5,545	0
Deferred revenue - non-current
Beginning balance	9,025	4,727
Increases to amounts invoiced, for which cash has not yet been received	3,282	3,829
Increase due to unbilled prepayments recorded during the period	0	7
Decreases due to amounts reclassified as current, to be recognized in the next twelve months	(809)	0
Ending balance	$ 11,498	$ 8,563