Strategic Alliance and Collaboration with Servier (Tables)

12 Months Ended

Dec. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Components of Collaboration Revenue

Collaboration revenue under the Servier Collaboration Agreement consisted of the following:

	Year Ended December 31,
	2018		2017
	(in thousands)
Milestone payments	$	3,690	$	—
Research and development reimbursable costs	3,683		3,097
Total collaboration revenue	$	7,373	$	3,097