Deferred Revenue (Tables)

3 Months Ended

Mar. 31, 2019

Revenue Recognition [Abstract]

Schedule of Deferred Revenue Activity

The following is a summary of the Company’s deferred revenue activity as of March 31, 2019:

(in thousands)	BED				Grants			Total
Balance as of December 31, 2018		$	644		$	568		$	1,212
Additions to deferred revenue		—			1,200			1,200
Recognized as revenue		(80		)	(1,575		)	(1,655		)
Balance as of March 31, 2019		$	564		$	193		$	757