Collaboration and License Agreements (Tables)

12 Months Ended

Dec. 31, 2019

Collaborative And License Agreements [Abstract]

Schedule of Changes in Deferred Revenue Balance

Changes in the deferred revenue balance during the year ended December 31, 2019 are as follows (in thousands):

	Deferred Revenue
Balance at December 31, 2018	$	18,813
Additions		—
Deductions		(4,297	)
Balance at December 31, 2019	$	14,516