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Revenue (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue Recognition [Abstract]  
Schedule of Deferred Revenue Activity
The following is a summary of the Company’s deferred revenue activity as of June 30, 2020:

(in thousands)
 
NIDA Grant
 
Total
Balance as of December 31, 2019
 
$
918

 
$
918

Additions to deferred revenue
 
—

 
—

Recognized as revenue
 
(101
)
 
(101
)
Balance as of June 30, 2020
 
$
817

 
$
817