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Quarterly Consolidated Financial Data (Unaudited) (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
Quarterly Consolidated Financial Data (Unaudited)                        
Operating revenues $ 30,067,000 $ 28,122,000 $ 28,086,000 $ 47,055,000 $ 55,130,000 $ 62,498,000 $ 43,335,000 $ 73,722,000 $ 50,802,000 $ 133,330,000 $ 234,685,000 $ 261,683,000
Loss from operations (11,282,000) (14,257,000) (13,266,000) (10,631,000) (8,141,000) (4,662,000) (18,065,000) (9,814,000) (6,984,000) (49,436,000) (40,682,000) (17,904,000)
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)
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 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)
Merger Exchange Ratio                   1.76