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Supplemental Consolidated Financial Statement Information – Impact of Adoption of Topic 606 on Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 01, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common stock dividend declared, percentage of shares outstanding | 5.00% |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  | $ 27,670,000 | $ 40,448,000 | $ 36,158,000 | $ 49,880,000 | $ 37,418,000 | $ 45,108,000 | $ 31,640,000 | $ 42,366,000 | $ 154,156,000 | $ 156,532,000 | $ 137,640,000
Operating costs: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  | 132,937,000 | 139,072,000 | 124,023,000
Loss from operations |  | (11,862,000) | (5,234,000) | (6,291,000) | (1,640,000) | (6,022,000) | (4,299,000) | (15,504,000) | (12,139,000) | (25,027,000) | (37,964,000) | (47,488,000)
Income tax benefit |  |  |  |  |  |  |  |  |  | 798,000 | 5,314,000 | 5,960,000
Net loss |  | $ (11,816,000) | $ (5,171,000) | $ (5,711,000) | $ (1,709,000) | $ (4,788,000) | $ (2,922,000) | $ (14,928,000) | $ (9,152,000) | $ (24,407,000) | $ (31,790,000) | $ (38,333,000)
Basic and diluted loss per share of common stock |  |  |  |  |  |  |  |  |  |  | $ (1.40) | $ (1.69)
Weighted average equivalent common shares outstanding - assuming dilution |  |  |  |  |  |  |  |  |  | 22,912,217 | 22,779,377 | 22,692,139
ASU 2014-09 | As Previously Reported |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ 157,148,000 | $ 133,330,000
Operating costs: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  | 139,164,000 | 121,661,000
Loss from operations |  |  |  |  |  |  |  |  |  |  | (37,440,000) | (49,436,000)
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | 6,449,000
Net loss |  |  |  |  |  |  |  |  |  |  | $ (31,266,000) | $ (39,792,000)
Basic and diluted loss per share of common stock |  |  |  |  |  |  |  |  |  |  | $ (1.44) | $ (1.84)
Weighted average equivalent common shares outstanding - assuming dilution |  |  |  |  |  |  |  |  |  |  | 21,694,645 | 21,611,562
ASU 2014-09 | Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  | $ (616,000) | $ 4,310,000
Operating costs: |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  | (92,000) | 2,362,000
Loss from operations |  |  |  |  |  |  |  |  |  |  | (524,000) | 1,948,000
Income tax benefit |  |  |  |  |  |  |  |  |  |  |  | (489,000)
Net loss |  |  |  |  |  |  |  |  |  |  | $ (524,000) | $ 1,459,000
Basic and diluted loss per share of common stock |  |  |  |  |  |  |  |  |  |  | $ (0.03) | $ 0.07
Stock Dividend Adjustments |  |  |  |  |  |  |  |  |  |  |  |
Operating costs: |  |  |  |  |  |  |  |  |  |  |  |
Basic and diluted loss per share of common stock |  |  |  |  |  |  |  |  |  |  | $ 0.07 | $ 0.08
Weighted average equivalent common shares outstanding - assuming dilution |  |  |  |  |  |  |  |  |  |  | 1,084,732 | 1,080,577

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