License and Development Agreements (Details) - USD ($)		1 Months Ended	12 Months Ended
	Sep. 27, 2019	Jan. 31, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2017
License agreements:
Collaboration revenue			$ 42,620	$ 0
Collaborative Agreement | Advaite, Inc.
License agreements:
Reduction of research and development expense			300,000
Collaboration revenue			42,620
Collaboration Agreement with CanSino Biologics
License agreements:
Term (in years)	10 years
Period within with CanSino to provide development cost statement	45 days
Period within which to reimburse CanSino of development costs	1 year
Schepens Eye Research Institute
License agreements:
Cancellation period, notice					180 days
License maintenance fee, year one					$ 25,000
License maintenance fee, year two					25,000
License maintenance fee, thereafter					100,000
Potential development and regulatory milestone payments					6,000,000.0
Potential commercial milestone payment					$ 10,100,000
Milestone payment			0
Royalty payments			$ 0
Cancellation notice, payments period					30 days
Cancellation notice, breach cure period, bankruptcy					90 days
Schepens Eye Research Institute Research Agreement
License agreements:
Cancellation period, notice					60 days
Collaboration agreement with University of Colorado
License agreements:
Cancellation period, notice			60 days
Potential development and regulatory milestone payments		$ 1,500,000
Milestone payment			$ 0
Royalty payments			$ 0
Cancellation notice, payments period					60 days
Minimum annual royalty payment					$ 20,000