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Regeneron License and Collaboration Arrangement (Tables)
 12 Months Ended
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]  
Summary of Change in Company's Contract Liabilities

The following table presents changes in the Company’s contract liabilities (in thousands):

 

Year ended December 31, 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

 

 

$

(17,903

)

 

$

13,980

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Year ended December 31, 2019

 

Balance at beginning

of period

 

 

Additions

 

 

Additions (Deductions) (1)

 

 

Balance at

end of

period

 

Contract liability

 

$

22,878

 

 

$

—

 

 

$

(995

)

 

$

21,883

 

(1)

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