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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Summary of Significant Accounting Policies - Concentrations (Details) $ in Thousands	Sep. 30, 2022 USD ($) issuer	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Concentration risk
Cash and cash equivalents	$ 18,846	$ 70,162	$ 27,260
Investments - debt securities	74,033	88,956
Investments - equity securities	334	450
U.S. Treasury Bills
Concentration risk
Investments - debt securities	74,033	88,956
Preferred stock
Concentration risk
Investments - equity securities	300	$ 500
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	1,100
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Investments - debt securities	74,000
Credit concentration risk \| Assets \| Preferred stock \| External Credit Rating, Non Investment Grade
Concentration risk
Investments - equity securities	$ 300
Number of issuers \| issuer	2