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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 |  |

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