Equity - Schedule of Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator for basic and diluted (loss) earnings per share attributable to common stockholders:
Net (loss) income attributable to common stockholders	$ (4,689)	$ (3,402)	$ 26,884	$ 8,139
Denominator:
Denominator for basic (loss) earnings per share—weighted average number of shares (in shares)	14,411,940	14,035,074	14,224,680	13,983,495
Effect of diluted securities (in shares)	0	0	133,333	0
Denominator for diluted (loss) earnings per share—adjusted weighted average number of shares and assumed conversions (in shares)	14,411,940	14,035,074	14,358,013	13,983,495
Basic (loss) earnings (in dollars per share)	$ (0.33)	$ (0.24)	$ 1.89	$ 0.58
Diluted (loss) earnings (in dollars per share)	$ (0.33)	$ (0.24)	$ 1.87	$ 0.58