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, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (7,184)	$ (1,050)	$ (3,811)	$ (9,282)	$ (8,234)	$ (13,093)
Loss attributable to common shareholders for diluted earnings per share	$ (7,184)		$ (3,811)		$ (8,234)	$ (13,093)
Weighted average number of common share equivalents:
Common shares used in basic loss per share	13,466,614		13,541,404		13,519,638	13,503,486
Total weighted average common shares and common share equivalents used in diluted loss per share	13,466,614		13,541,404		13,519,638	13,503,486
Loss per share:
Basic	$ (0.53)		$ (0.28)		$ (0.61)	$ (0.97)
Diluted	$ (0.53)		$ (0.28)		$ (0.61)	$ (0.97)