Debt - Interest expense on 2018-1 Notes (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Components of interest expense
Borrowing interest expense	$ 3,952,000
Total interest and debt financing expenses	$ 4,272,000
2018-1 Notes
Components of interest expense
Borrowing interest expense		$ 1,997	$ 1,299	$ 6,042
Amortization of deferred financing costs and upfront commitment fees		44	28	130
Total interest and debt financing expenses		$ 2,041	$ 1,327	$ 6,172