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Net (Loss) Income per Share Attributable to Common Stock (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2014
Net (Loss) Income per Share Attributable to Common Stock                        
Net loss $ (7,187,000) $ (12,416,000) $ (11,589,000) $ (8,600,000) $ (4,940,000) $ (2,870,000) $ (11,877,000) $ (6,592,000) $ (4,991,000) $ (39,792,000) $ (26,279,000) $ (12,620,000)
Income allocable to unvested restricted stock                 (9,000)     (26,000)
Basic loss attributable to common stock                 (5,000,000) (39,792,000) (26,279,000) (12,646,000)
Diluted loss attributable to common stock                 $ (5,000,000) $ (39,792,000) $ (26,279,000) $ (12,646,000)
Weighted average common shares outstanding:                        
Basic                 14,019,813 21,611,562 20,688,185 14,008,635
Diluted                 14,019,813 21,611,562 20,688,185 14,008,635
Basic loss per share attributable to common stock $ (0.33) $ (0.57) $ (0.54) $ (0.40) $ (0.23) $ (0.13) $ (0.55) $ (0.37) $ (0.36) $ (1.84) $ (1.27) $ (0.90)
Diluted loss attributable to a share of common stock $ (0.33) $ (0.57) $ (0.54) $ (0.40) $ (0.23) $ (0.13) $ (0.55) $ (0.37) $ (0.36) $ (1.84) $ (1.27) $ (0.90)