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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, 2021 USD ($) issuer	Dec. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)
Concentration risk
Cash and cash equivalents	$ 52,313	$ 106,794	$ 106,427
Investments - debt securities	93,973	48,051
Investments - equity securities	1,589	2,623
Preferred stock
Concentration risk
Investments - equity securities	1,600	$ 2,600
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Cash and cash equivalents	16,000
Investments - debt securities	94,000
Credit concentration risk \| Assets \| Money Market Funds
Concentration risk
Cash and cash equivalents	17,000
Credit concentration risk \| Assets \| Preferred stock \| Non-investment grade
Concentration risk
Investments - equity securities	$ 1,600
Number of issuers \| issuer	2