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Condensed Quarterly 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
Condensed Quarterly Financial Data (unaudited)
Total revenue	$ 10,941	$ 7,090	$ 13,340	$ 4,340	$ 6,440	$ 7,821	$ 66,007	$ 7,252	$ 35,711	$ 87,520	$ 27,762
Income (loss) from operations	(13,882)	(16,490)	(7,670)	(15,519)	(10,028)	(9,255)	48,556	(6,733)	(53,562)	22,540	(18,338)
Net income (loss)	$ (11,843)	$ (15,562)	$ (6,885)	$ (14,635)	$ (9,065)	$ (8,077)	$ 47,156	$ (6,398)	$ (48,925)	$ 23,625	$ (17,592)
Basic net income (loss) (in dollars per share)	$ (0.25)	$ (0.33)	$ (0.15)	$ (0.31)	$ (0.21)	$ (0.20)	$ 1.16	$ (0.16)	$ (1.05)	$ 0.57	$ (0.45)
Diluted net income (loss) (in dollars per share)	$ (0.25)	$ (0.33)	$ (0.15)	$ (0.31)	$ (0.21)	$ (0.20)	$ 1.13	$ (0.16)	$ (1.05)	$ 0.56	$ (0.45)

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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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