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Liquidity (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 22, 2023
Subsidiary, Sale of Stock [Line Items]
Net loss	$ 2,191,000	$ 6,397,000	$ 4,093,000	$ 14,137,000
Net cash provided by (used in) operating activities			6,072,000	$ (11,030,000)
Unrestricted cash and cash equivalents	26,300,000		26,300,000
Shelf registration
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount					$ 125,000,000
ATM Facility
Subsidiary, Sale of Stock [Line Items]
Sale of securities, authorized amount					$ 47,800,000
Available amount remaining under ATM facility	47,800,000		47,800,000
Western Alliance Bank
Subsidiary, Sale of Stock [Line Items]
Line of credit maximum capacity	10,000,000		10,000,000
Line of credit current availability	4,900,000		4,900,000
Line of credit outstanding borrowings	$ 0		$ 0

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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