Revenue (Tables)

9 Months Ended

Sep. 30, 2021

Revenue.

Schedule of recognized revenue under funding, license and collaboration agreements

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Symbio
Upfront license fee recognition over time	$	57,000	$	56,000	$	170,000	$	169,000
Supplies		—		10,000		—		5,000
	$	57,000	$	66,000	$	170,000	$	174,000

Schedule of deferred revenue

	Symbio
	Upfront Payment
Deferred balance at December 31, 2020	$	3,695,000
Recognition to revenue		170,000
Deferred balance at September 30, 2021	$	3,525,000