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Condensed Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	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
Condensed Quarterly Financial Data (unaudited)
Total revenue	$ 11,564	$ 29,039			$ 30,150		$ 12,500	$ 3,500	$ 40,603	$ 46,150	$ 109,020
Income (loss) from operations	(21,082)	651	$ (28,290)	$ (30,649)	5,326	$ (23,580)	(8,510)	(16,359)	(79,370)	(43,123)	44,040
Net income (loss)	$ (18,197)	$ 3,150	$ (25,869)	$ (29,493)	$ 7,366	$ (22,652)	$ (7,725)	$ (15,475)	$ (70,409)	$ (38,486)	$ 45,125
Basic net income (loss) (in dollars per share)	$ (0.32)	$ 0.06	$ (0.46)	$ (0.62)	$ 0.16	$ (0.48)	$ (0.17)	$ (0.33)	$ (1.31)	$ (0.82)	$ 1.09
Diluted net income (loss) (in dollars per share)	$ (0.32)	$ 0.05	$ (0.46)	$ (0.62)	$ 0.15	$ (0.48)	$ (0.17)	$ (0.33)	$ (1.31)	$ (0.82)	$ 1.07

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