Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 22,007	$ 13,348	$ 13,976	$ 11,008	$ 9,564	$ 16,077	$ 18,944	$ 18,661	$ 56,555	$ 67,030	$ 133,776
Operating income (loss)	3,606	(72,301)	(4,952)	(31,898)	(40,143)	(63,438)	(1,531)	(4,535)	(73,387)	(141,805)	39,922
Net income (loss)	$ (5,301)	$ (67,419)	$ (3,260)	$ (46,937)	$ (40,880)	$ (52,372)	$ (6,601)	$ (718)	$ (96,378)	$ (127,110)	$ 63,269
Net income (loss) per common share - basic (in dollars per share)	$ (0.04)	$ (0.64)	$ (0.02)	$ (0.40)	$ (0.39)	$ (0.50)	$ (0.06)	$ (0.01)	$ (0.79)	$ (1.21)	$ 0.64
Net income (loss) - per common share - diluted (in dollars per share)	$ (0.04)	$ (0.64)	$ (0.02)	$ (0.40)	$ (0.39)	$ (0.50)	$ (0.06)	$ (0.01)	$ (0.79)	$ (1.21)	$ 0.62