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Regeneron License and Collaboration Arrangement (Tables)
9 Months Ended
Sep. 30, 2021
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 nine months ended September 30, 2021 and 2020 (in thousands):

 

Nine Months Ended September 30, 2021

 

Balance at
Beginning
of Period

 

 

Additions

 

 

Additions (Deductions)
(1)

 

 

Balance at
End of Period

 

Contract liability

 

$

13,980

 

 

$

370

 

 

$

(4,262

)

 

$

10,088

 

 

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

 

 

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