Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Sep. 30, 2018
ASSETS
Allowances for accounts receivable	$ 373	$ 378
LIABILITIES AND STOCKHOLDERS’ EQUITY
Debt (premium) discounts	(2,254)	(2,640)
Debt issuance costs	$ 12,911	$ 14,336
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	33,043,664	33,522,046
Common stock, shares outstanding	32,043,664	33,522,046