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Collaboration and License Agreements (Tables)
 12 Months Ended
Dec. 31, 2020
Collaborative And License Agreements [Abstract]  
Schedule of Changes in Deferred Revenue Balance

Changes in the deferred revenue balance during the year ended December 31, 2020 are as follows (in thousands):

 

 

 

Deferred Revenue

 

Balance at December 31, 2019

 

$

14,516

 

Additions

 

 

—

 

Deductions

 

 

(2,821

)

Balance at December 31, 2020

 

$

11,695