Calculation of Net income (Loss) and Weighted Average Common Shares and Common Equivalent Shares Outstanding for Computation of Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income (loss)	$ 707	$ (5,853)	$ (4,729)	$ (9,480)	$ (5,146)	$ (14,209)
Less: Income (loss) allocable to unvested restricted stock	(12)
Income (loss) attributable to common shareholders for diluted earnings per share	$ 695		$ (4,729)		$ (5,146)	$ (14,209)
Weighted average common shares outstanding:
Common shares used in basic income (loss) per share	13,401,135		13,264,710		13,369,932	13,233,205
Common share equivalents outstanding related to stock options and RSUs	156,050
Total weighted average common shares and common share equivalents used in diluted income (loss) per share	13,557,185		13,264,710		13,369,932	13,233,205
Income (loss) per share:
Basic	$ 0.05		$ (0.36)		$ (0.38)	$ (1.07)
Diluted	$ 0.05		$ (0.36)		$ (0.38)	$ (1.07)