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Net (Loss) Income per Share Attributable to Common Stock (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Sep. 30, 2014
Sep. 30, 2013
Net (Loss) Income per Share Attributable to Common Stock                        
Net (loss) income $ (4,940,000) $ (2,870,000) $ (11,877,000) $ (6,592,000) $ (4,991,000) $ (3,882,000) $ (7,493,000) $ 1,652,000 $ (2,897,000) $ (26,279,000) $ (12,620,000) $ 10,480,000
Income allocable to unvested restricted stock         (9,000)           (26,000) (136,000)
Basic (loss) income attributable to common stock         (5,000,000)         (26,279,000) (12,646,000) 10,344,000
Reallocation of participating earnings                       1,000
Diluted (loss) income attributable to common stock         $ (5,000,000)         $ (26,279,000) $ (12,646,000) $ 10,345,000
Weighted average common shares outstanding:                        
Basic         14,019,813         20,688,185 14,008,635 13,868,120
Dilutive common stock options and restricted stock units                       71,721
Diluted         14,019,813         20,688,185 14,008,635 13,939,841
Basic (loss) income attributable to a share of common stock $ (0.23) $ (0.13) $ (0.55) $ (0.37) $ (0.36) $ (0.28) $ (0.54) $ 0.12 $ (0.20) $ (1.27) $ (0.90) $ 0.75
Diluted (loss) income attributable to a share of common stock $ (0.23) $ (0.13) $ (0.55) $ (0.37) $ (0.36) $ (0.28) $ (0.54) $ 0.12 $ (0.20) $ (1.27) $ (0.90) $ 0.74