Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)	Sep. 30, 2020	May 31, 2020	Dec. 31, 2019	May 31, 2019
Leases [Abstract]
Operating lease right-of-use assets, net	$ 848,000	$ 172,000	$ 625,000
Short-term operating lease liability	279,000
Long-term operating lease liability	244,000
Operating lease liability	523,000	172,000		$ 0
Finance lease right of use asset	556,000		559,000
Finance lease accumulated amortization	(280,000)		(107,000)
Total finance lease right of use asset, net	$ 276,000		$ 452,000
Weighted average remaining lease term
Operating leases	1 year 3 months 18 days		1 year 7 months 6 days
Finance leases	1 year 2 months 12 days		2 years 1 month 6 days
Weighted average discount rate
Operating leases	2.10%
Operating Lease, Liability, Payment, Due [Abstract]
2020 (excluding the nine months ended September 30, 2020)	$ 80,000
2021	245,000
2022	141,000
2023	70,000
Total lease payments	536,000
Less: imputed interest	(13,000)
Operating lease liability	$ 523,000	$ 172,000		$ 0