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License and Collaboration Agreements (Tables)
 6 Months Ended
Jun. 30, 2020
License And Collaboration Agreements [Abstract]  
Summary of Revenue Recognized as a Result of Changes in Deferred Revenue

The Company recognized the following revenue as a result of changes in the deferred revenue balance during the period below (in thousands):

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

Revenue recognized in the period from:

2020

 

2019

 

 

2020

 

2019

 

Amounts included in deferred revenue at the beginning of the period

$

1,750

 

$

1,750

 

 

$

3,500

 

$

3,500

 

Performance obligations satisfied in previous period

 

-

 

 

-

 

 

 

-

 

 

-