Leases - Supplemental Balance Sheet Information Related to Leases (Details) - USD ($)	Dec. 31, 2021	Jul. 31, 2021	Dec. 31, 2020	May 31, 2020	May 31, 2019
Leases [Abstract]
Operating lease right-of-use assets, net	$ 1,165,000	$ 44,000	$ 674,000	$ 172,000
Short-term operating lease liability	$ 741,000		$ 238,000
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other current liabilities		Accrued expenses and other current liabilities
Long-term operating lease liabilities	$ 420,000		$ 208,000
Operating lease liability	1,161,000		446,000	172,000	$ 0
Finance lease right of use asset	557,000		557,000
Finance lease accumulated amortization	$ (557,000)		(337,000)
Total finance lease right of use asset, net			$ 220,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other Assets Noncurrent		Other Assets Noncurrent
Weighted average remaining lease term
Operating leases	1 year 7 months 6 days		1 year 7 months 6 days
Finance leases			10 months 24 days
Weighted average discount rate
Operating leases	1.87%		2.10%
Finance leases	0.00%
2022	$ 757,000
2023	422,000
Total lease payments	1,179,000
Less: imputed interest	(18,000)
Operating lease liability	$ 1,161,000		$ 446,000	$ 172,000	$ 0