Calculation of Net Earnings (Loss) and Weighted Average Common Shares and Common Equivalent Shares Outstanding for Computation of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss)	$ (12,309)	$ (11,654)	$ (10,965)	$ (11,042)	$ (13,450)	$ (8,564)	$ (5,182)	$ (5,445)	$ (45,970)	$ (32,641)	$ 36,911
Less: Income allocable to unvested restricted stock											(444)
Income (loss) available to common shareholders									(45,970)	(32,641)	36,467
Reallocation of participating earnings											2
Income (loss) attributable to common shareholders for diluted earnings per share									$ (45,970)	$ (32,641)	$ 36,469
Weighted average number of common share equivalents:
Common shares used in basic earnings (loss) per share									13,044,875	12,996,958	12,950,958
Common share equivalents outstanding related to stock options											46,051
Total weighted average common shares and common share equivalents used in diluted earnings per share									13,044,875	12,996,958	12,997,009
Basic	$ (0.94)	$ (0.89)	$ (0.84)	$ (0.85)	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (3.52)	$ (2.51)	$ 2.82
Diluted	$ (0.94)	$ (0.89)	$ (0.84)	$ (0.85)	$ (1.03)	$ (0.66)	$ (0.40)	$ (0.41)	$ (3.52)	$ (2.51)	$ 2.81