Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
LIABILITIES AND STOCKHOLDERS’ EQUITY
Allowances for accounts receivable	$ 348	$ 358
Unamortized debt issuance expense	$ 10,483	$ 10,891
Preferred stock, par value (in US$ per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in US$ per share)	$ 0.001	$ 0.001
Common stock, shares authorized	63,000,000	63,000,000
Common stock, shares issued	31,253,816	31,012,326
Common stock, shares outstanding	31,253,816	31,012,326