Collaboration Agreements (Tables)

6 Months Ended

Jun. 30, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Collaboration Revenue

Revenue disaggregated by collaboration agreement and performance obligation is as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2020		2019		2020		2019
Takeda Collaboration Agreement(1)	$	5,537	$	740	$	8,555	$	1,422
Sanofi Collaboration Agreement
Alzheimer's Disease Services(1)	36		99		88		193
Retained Activities	274		3,358		808		6,787
Total Sanofi Collaboration Revenue	310		3,457		896		6,980
Total Collaboration Revenue	$	5,847	$	4,197	$	9,451	$	8,402

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(1)Amounts represent revenue recognized during the period that was included in the contract liability balance at the beginning of the period.