Related Party Transactions - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Balance with Fund Manager	$ 16,540,000		$ 19,062,000
Maximum [Member]
Related Party Transaction [Line Items]
Fund management fee percent	0.25%
Other Income (Expense) [Member]
Related Party Transaction [Line Items]
Investment income generated from mutual funds	$ 203,000	$ 106,000
Cash and Cash Equivalents [Member]
Related Party Transaction [Line Items]
Balance with Fund Manager	10,557,000		13,282,000
Marketable Securities [Member]
Related Party Transaction [Line Items]
Balance with Fund Manager	$ 5,983,000		$ 5,780,000