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Celgene Collaboration Agreement (Tables)
 12 Months Ended
Dec. 31, 2019
Research and Development [Abstract]  
Schedule Of Changes In Contract Liabilities
The following table presents changes in the Company’s contract liabilities related to the Celgene Collaboration Agreement during the year ended December 31, 2019 (in thousands):
 
Balance as of
 
 
 
 
 
Balance as of
 
January 1, 2019
 
Additions
 
Reductions
 
December 31, 2019
Contract liabilities:
 
 
 
 
 
 
 
Deferred revenue—related party
$
97,872

 
$
—

 
$
(97,872
)
 
$
—

Totals
$
97,872

 
$
—

 
$
(97,872
)
 
$
—