Earnings (Loss) Per Share of Common Stock - Reconciliation of Numerator and Denominator for Basic and Diluted Earnings (loss) Per Share Calculation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (3,606)	$ (22,064)	$ (12,433)	$ (2,740)
Weighted average number of common shares outstanding – basic and diluted	102,785	77,048	102,643	77,052
Basic and diluted loss per share	$ (0.04)	$ (0.29)	$ (0.12)	$ (0.04)
Weighted average number of anti-dilutive options and restricted stock	4,845		5,102