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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	Mar. 31, 2022 USD ($) issuer	Dec. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)
Concentration risk
Cash and cash equivalents	$ 33,115	$ 70,162	$ 52,313
Investments - debt securities	118,173	88,956
Investments - equity securities	474	450
Preferred stock
Concentration risk
Investments - equity securities	500	$ 500
Credit concentration risk \| Assets \| Money market fund
Concentration risk
Cash and cash equivalents	8,900
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Investments - debt securities	118,200
Credit concentration risk \| Assets \| Preferred stock \| External Credit Rating, Non Investment Grade
Concentration risk
Investments - equity securities	$ 500
Number of issuers \| issuer	2