Regeneron License and Collaboration Arrangement (Tables)

9 Months Ended

Sep. 30, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Summary of Change in Company's Contract Liabilities

The following tables present changes in the Company’s contract liabilities for the three and nine months ended September 30, 2020 and 2019 (in thousands):

Nine Months Ended September 30, 2020	Balance at beginning of period		Additions		Additions (Deductions) (1)			Balance at end of period
Contract asset	$	—	$	10,000	$	(10,000	)	$	—
Contract liability	$	21,883	$	10,000	$	(12,493	)	$	19,390

Nine Months Ended September 30, 2019	Balance at beginning of period		Additions		Additions (Deductions) (1)		Balance at end of period
Contract liability	$	22,878	$	—	$	974	$	23,852

⁽¹⁾ Additions (deductions) to contract liabilities relate to deferred revenue derecognized (recognized) as revenue during the reporting period.