CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
ASSETS
Allowances for accounts receivable	$ 304	$ 378
LIABILITIES AND STOCKHOLDERS’ EQUITY
Debt (premium) discounts	0	(2,640)
Debt issuance costs	$ 12,470	$ 14,336
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	63,000,000	63,000,000
Common stock, shares issued (in shares)	30,933,110	33,522,046
Common stock, shares outstanding (in shares)	30,933,110	33,522,046