Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Sep. 30, 2017
ASSETS
Allowances for accounts receivable	$ 346	$ 330
LIABILITIES AND STOCKHOLDERS’ EQUITY
Debt (premium) discounts	(3,027)	(3,413)
Debt issuance costs	$ 15,905	$ 14,800
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	33,628,126	33,515,768
Common stock, shares outstanding	33,628,126	33,515,768