Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Feb. 28, 2020
Leases [Abstract]
Right-of-use-asset	$ 2,952		$ 2,952		$ 3,618
Lease liability	2,976		2,976		$ 3,701
Operating lease expense	$ 239	$ 241	482	$ 492
Operating cash flows from leases			$ 522	$ 519
Weighted average remaining lease term	3 years 10 months 24 days		3 years 10 months 24 days		4 years 10 months 24 days
Weighted average discount rate	4.40%		4.40%		4.10%
Maturity of Operating Lease Liabilities [Abstract]
2021	$ 463		$ 463		$ 971
2022	887		887		879
2023	722		722		713
2024	722		722		718
2025	427		427		464
Thereafter	24		24		180
Total undiscounted lease payments	3,245		3,245		3,925
Less imputed interest	269		269		224
Total lease liabilities	$ 2,976		$ 2,976		$ 3,701
Minimum [Member]
Leases [Abstract]
Remaining lease terms	1 year		1 year
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
Right-of-use-asset						$ 1,500
Lease liability						1,500
Maturity of Operating Lease Liabilities [Abstract]
Total lease liabilities						$ 1,500