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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	Jun. 30, 2020 USD ($) issuer	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Concentration risk
Investments - debt securities	$ 49,996	$ 53
Investments - equity securities	2,415	9,746
Cash and cash equivalents	106,039	185,716	$ 195,587
Preferred stock
Concentration risk
Investments - equity securities	2,400	$ 9,700
Assets \| Money market fund
Concentration risk
Cash and cash equivalents	87,000
Credit concentration risk \| Assets \| U.S. Treasury Bills
Concentration risk
Investments - debt securities	49,900
Credit concentration risk \| Assets \| Preferred stock \| Non-investment grade
Concentration risk
Investments - equity securities	$ 2,400
Number of issuers \| issuer	3