A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Commitments and Contingencies, Operating Leases (Details) - USD ($) $ in Millions		3 Months Ended
	Mar. 26, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jun. 07, 2018
Operating Leases [Abstract]
Rent expense		$ 0.3	$ 0.3
ESB Lease Agreement [Member]
Operating Leases [Abstract]
Term of lease agreement		3 years
Letter of credit					$ 0.9
Lease expiration date		Aug. 29, 2024
Certificate of deposit		$ 0.8		$ 0.8
ESB Lease Agreement Amendment [Member]
Operating Leases [Abstract]
Letter of credit		$ 0.8
Lease expiration date		Jun. 30, 2024
Operating lease right of use asset, adjustment	$ 1.1
Inotek Lexington Massachusetts Lease Agreement [Member]
Operating Leases [Abstract]
Lease expiration date		Feb. 28, 2023
Rental income received under sublease agreement		$ 0.1	$ 0.1