Leases (Details) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Apr. 30, 2021	Feb. 28, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases [Abstract]
Operating lease expense			$ 235	$ 243	$ 717	$ 735
Operating cash flows from leases					$ 750	$ 779
Weighted average remaining lease term			3 years 8 months 12 days		3 years 8 months 12 days		4 years 10 months 24 days
Weighted average discount rate			4.40%		4.40%		4.10%
Maturity of Operating Lease Liabilities [Abstract]
2021			$ 232		$ 232		$ 971
2022			886		886		879
2023			720		720		713
2024			721		721		718
2025			426		426		464
Thereafter			23		23		180
Total undiscounted lease payments			3,008		3,008		3,925
Less imputed interest			236		236		224
Total lease liabilities			$ 2,772		$ 2,772		$ 3,701
Minimum [Member]
Leases [Abstract]
Remaining lease terms			1 year		1 year
Extension period for leases			2 years		2 years
Maximum [Member]
Leases [Abstract]
Remaining lease terms			5 years		5 years
Extension period for leases			5 years		5 years
Termination period for leases					1 year
Facility in Ithaca, New York [Member]
Leases [Abstract]
Extension period for leases			4 years		4 years
Increase (decrease) in right-of-use-asset		$ 1,500
Increase (decrease) in operating lease liability		$ 1,500
Facility in Hamden, Connecticut [Member]
Leases [Abstract]
Extension period for leases	2 years
Increase (decrease) in right-of-use-asset	$ (300)
Increase (decrease) in operating lease liability	$ (300)