Revolving Credit Facility - Components of Interest Expense (Details) - Line of Credit - Revolving Credit Facility - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Line of Credit Facility [Line Items]
Interest expense, net of capitalized interest	$ 384		$ 962	$ 896	$ 2,002
Amortization of debt financing costs	191		160	473	316
Unused commitment fees	103		43	205	82
Total interest expense, net	$ 678		$ 1,165	$ 1,574	$ 2,400
Write-off of unamortized deferred financing costs		$ 100