CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
ASSETS
Allowances for accounts receivable	$ 290	$ 290
LIABILITIES AND STOCKHOLDERS’ EQUITY
Unamortized debt issuance expense	$ 8,151	$ 8,983
Preferred stock, par value (in USD per share)	$ 0.01	$ 0.01
Preferred stock authorized (in shares)	5,000,000	5,000,000
Preferred stock issued (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	63,000,000	63,000,000
Common stock issued (in shares)	31,457,627	31,294,198
Common stock outstanding (in shares)	31,457,627	31,294,198