Leases - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Leases [Line Items]
Operating lease, right-of-use asset	$ 100,000		$ 100,000
Lessee operating lease, discount rate	5.00%		5.00%
Right-of-use asset, operating lease costs	$ 38,000		$ 100,000
Short-term lease costs	100,000		200,000
Rental revenue	16,390,000	$ 14,278,000	33,005,000	$ 21,694,000
Future minimum lease payments to be received	16,400,000		16,400,000
Lease deposits	$ 400,000		$ 400,000
Maximum
Leases [Line Items]
Lease term	6 months		6 months