Notes Payable - Paycheck Protection Program Loan (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	May 01, 2020
Debt Instrument [Line Items]
Gain on extinguishment of debt	$ 722,000
Liabilities	39,906,000	$ 23,798,000
Paycheck Protection Program (the "PPP")
Debt Instrument [Line Items]
Aggregate loan amount granted	715,000		$ 715,000
Gain on extinguishment of debt	722,000
Accrued interest	7,000
Liabilities	$ 0

Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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+ Details