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								12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net loss	$ (207)	$ (4,796)	$ (4,729)	$ (9,480)	$ (19,207)	$ (14,376)	$ (11,503)	$ (11,705)	$ (19,212)	$ (56,791)	$ (45,970)
Loss available to common shareholders									(19,212)	(56,791)	(45,970)
Loss attributable to common shareholders for diluted earnings per share									$ (19,212)	$ (56,791)	$ (45,970)
Weighted average number of common share equivalents:
Common shares used in basic loss per share									13,250,867	13,134,071	13,044,875
Total weighted average common shares and common share equivalents used in diluted loss per share									13,250,867	13,134,071	13,044,875
Loss per shares:
Basic	$ (0.02)	$ (0.36)	$ (0.36)	$ (0.72)	$ (1.46)	$ (1.09)	$ (0.88)	$ (0.89)	$ (1.45)	$ (4.32)	$ (3.52)
Diluted	$ (0.02)	$ (0.36)	$ (0.36)	$ (0.72)	$ (1.46)	$ (1.09)	$ (0.88)	$ (0.89)	$ (1.45)	$ (4.32)	$ (3.52)