Quarterly report pursuant to Section 13 or 15(d)

Investments in Non-Marketable Securities - Carrying Value and Fair Value of Securities (Details)

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Investments in Non-Marketable Securities - Carrying Value and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Marketable Securities [Line Items]    
Adjusted Cost and Carrying Value $ 1,067 $ 1,000
Fair Value 1,067 1,000
Security Owned Not Readily Marketable MAI [Member]    
Marketable Securities [Line Items]    
Investment in non-marketable equity securities $ 2,350 $ 1,450