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Recently Issued Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Consolidated Statements of Operations and Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 39,125 | $ 45,627 | $ 30,469 | $ 41,927 | $ 30,067 | $ 28,122 | $ 28,086 | $ 47,055 | $ 157,148 | $ 133,330 | $ 234,685
Operating expenses |  |  |  |  |  |  |  |  | 194,588 | 182,766 | 275,367
Loss from operations | (5,778) | (4,136) | (15,385) | (12,141) | (11,282) | (14,257) | (13,266) | (10,631) | (37,440) | (49,436) | (40,682)
Net loss | $ (4,544) | $ (2,759) | $ (14,809) | $ (9,154) | $ (7,187) | $ (12,416) | $ (11,589) | $ (8,600) | $ (31,266) | $ (39,792) | $ (26,279)
Diluted loss per share attributable to common stock | $ (0.21) | $ (0.13) | $ (0.68) | $ (0.42) | $ (0.33) | $ (0.57) | $ (0.54) | $ (0.40) | $ (1.44) | $ (1.84) | $ (1.27)
Consolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 33,138 |  |  |  | $ 16,031 |  |  |  | $ 33,138 | $ 16,031 |
Prepaid expenses and other current assets | 4,677 |  |  |  | $ 4,822 |  |  |  | 4,677 | 4,822 |
ASU 2014-09 | Pro Forma |  |  |  |  |  |  |  |  |  |  |
Consolidated Statements of Operations and Comprehensive Loss |  |  |  |  |  |  |  |  |  |  |
Operating revenues |  |  |  |  |  |  |  |  | 156,532 | 137,640 |
Operating expenses |  |  |  |  |  |  |  |  | 139,072 | 124,024 |
Loss from operations |  |  |  |  |  |  |  |  | (37,964) | (47,489) |
Net loss |  |  |  |  |  |  |  |  | $ (31,790) | $ (37,845) |
Diluted loss per share attributable to common stock |  |  |  |  |  |  |  |  | $ (1.47) | $ (1.75) |
Consolidated Balance Sheets |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | 33,157 |  |  |  |  |  |  |  | $ 33,157 |  |
Prepaid expenses and other current assets | 7,339 |  |  |  |  |  |  |  | 7,339 |  |
Deferred revenue | $ 6,314 |  |  |  |  |  |  |  | $ 6,314 |  |

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