Loss Per Common Share - Calculation of Net 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, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ (11,804)	$ (1,289)	$ 707	$ (5,853)	$ (13,093)	$ (5,146)
Less: Income (loss) allocable to unvested restricted stock			(12)
Income (loss) attributable to common shareholders for diluted earnings per share	$ (11,804)		$ 695		$ (13,093)	$ (5,146)
Weighted average number of common share equivalents:
Common shares used in basic income (loss) per share	13,541,404		13,401,135		13,503,486	13,369,932
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	13,541,404		13,557,185		13,503,486	13,369,932
Income (loss) per share:
Basic	$ (0.87)		$ 0.05		$ (0.97)	$ (0.38)
Diluted	$ (0.87)		$ 0.05		$ (0.97)	$ (0.38)