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Unaudited Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | ---
ASSETS |  |
Allowances for accounts receivable | $ 193 | $ 354
LIABILITIES AND STOCKHOLDERS’ EQUITY |  |
Debt (premium) discounts | (3,799) | (1,482)
Debt issuance costs | $ 15,709 | $ 15,514
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 | 33,544,628 | 33,071,331
Common stock, shares outstanding | 33,544,628 | 33,071,331

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