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Financial Instruments - Additional Information (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2023 USD ($) security	Jun. 30, 2023 USD ($) security
Financial Instruments
Interest receivable	$ 102,000	$ 102,000
Allowance for credit loss	0	0
Available for sales debt securities, current	19,100,000	19,100,000
Available for sales debt securities, non-current	$ 10,100,000	$ 10,100,000
Available-for-sale debt securities, loss position, current, number of positions | security	6	6
Available-for-sale debt securities, loss position, current	$ 6,100,000	$ 6,100,000
Available-for-sale debt securities, loss position, non-current, number of positions | security	27	27
Available-for-sale debt securities, loss position, non-current	$ 20,900,000	$ 20,900,000
BFTR, LLC
Financial Instruments
Investment percentage (as a percent)	18.00%	18.00%

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

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