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Collaboration and Licensing Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred revenue - current
Beginning balance	$ 4,177
Ending balance	0	$ 4,177
Deferred revenue - non-current
Beginning balance	0
Ending balance	4,727	0
2019 KKC Agreement
Deferred revenue - current
Beginning balance	4,177	4,541
Decreases due to revenue recognized in the period for which cash has been received	(4,177)	(364)
Ending balance	0	4,177
2017 KKC Agreement
Deferred revenue - non-current
Beginning balance	0	0
Increases due to cash received during the period	3,242	0
Increase due to unbilled prepayments recorded during the period	1,485	0
Ending balance	$ 4,727	$ 0

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=123360276&loc=SL49130531-203044

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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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