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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