Revenue (Tables)

6 Months Ended

Jun. 30, 2021

Revenue Recognition [Abstract]

Schedule of Deferred Revenue Activity

The following is a summary of the Company’s deferred revenue activity as of June 30, 2021:

(in thousands)	NIDA Grant		Total
Balance as of December 31, 2020	$	355	$	355
Additions to deferred revenue	1,187		1,187
Recognized as revenue	(1,542)		(1,542)
Balance as of June 30, 2021	$	—	$	—