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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 amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

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

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Significant Accounting Policies - Concentrations (Details) $ in Thousands	Dec. 31, 2021 USD ($) issuer	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Concentration risk
Cash and cash equivalents	$ 70,162	$ 106,794	$ 185,716
Investments - debt securities	88,956	48,051
Investments - equity securities	450	2,623
Preferred stock
Concentration risk
Investments - equity securities	500	$ 2,600
Credit concentration risk \| Assets
Concentration risk
Cash amount not insured by FDIC	21,500
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	4,000
Credit concentration risk \| Assets \| U.S. Treasury Bills \| External Credit Rating, Non Investment Grade
Concentration risk
Investments - debt securities	89,000
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	40,400
Credit concentration risk \| Assets \| Preferred stock \| External Credit Rating, Non Investment Grade
Concentration risk
Investments - equity securities	$ 500
Number of issuers \| issuer	2