Investments - Narrative (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Proceeds from sales of marketable securities	$ 0	$ 0
Realized gains or losses from debt securities available-for-sale	0	0	$ 0	$ 0
Unrealized loss position of debt securities	0		0		$ 0
Fair Value	23,658,000		23,658,000		32,131,000
Fair value of equity securities	600,000		600,000		$ 400,000
Unrealized losses on equity securities	0	0	0	0
Realized gains or losses from equity securities	0	0	0	0
Debt securities available-for-sale below Company's minimum credit rating
Debt Securities, Available-for-sale [Line Items]
Fair Value	300,000		300,000
Debt securities available-for-sale
Debt Securities, Available-for-sale [Line Items]
Reclassified from accumulated OCI	$ 0	$ 0	$ 0	$ 0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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