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		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2018
Earnings Per Share [Abstract]
Net (loss) income	$ (8,827)	$ 19,324	$ (15,087)
Weighted average number of common shares outstanding – basic and diluted	102,502	77,065
Basic and diluted (loss) earnings per share	$ (0.09)	$ 0.25
Weighted average number of anti-dilutive options and restricted stock	5,891