Equity Distribution Agreement and Sale of Common Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2020	Apr. 24, 2020	Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items]
Common stock, par or stated value per share (in dollars per share)	$ 0.01		$ 0.01
Equity Distribution Agreement Commission Rate		3.00%
Sales Agreement with Northland
Subsidiary, Sale of Stock [Line Items]
Common stock, par or stated value per share (in dollars per share)		$ 0.01
Equity Distribution Agreement Maximum Amount		$ 13.9
Common stock issuance (in shares)	573,199
Proceeds from Issuance of Common Stock	$ 2.2
Proceeds From Issuance Of Common Stock, Net	$ 2.1