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Quarterly Consolidated Financial Data (Unaudited) (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
Quarterly Consolidated Financial Data (Unaudited)
Operating revenues	$ 39,125	$ 45,627	$ 30,469	$ 41,927	$ 30,067	$ 28,122	$ 28,086	$ 47,055	$ 157,148	$ 133,330	$ 234,685
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)
Basic 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)
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)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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