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Summary of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ 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 Financial Information Disclosure [Abstract]
Revenues	$ 94,517	$ 60,774	$ 6,335	$ 0	$ 0	$ 0	$ 0	$ 15,000	$ 161,626	$ 15,000	$ 19,769
Operating expenses	82,683	66,769	63,603	79,932	46,251	38,436	41,828	35,857	292,987	162,372	113,971
Net (loss) income	$ 6,894	$ (11,125)	$ (59,985)	$ (78,326)	$ (44,659)	$ (36,887)	$ (40,280)	$ (19,264)	$ (142,542)	$ (141,090)	$ (88,929)
Net (loss) income per share:
Basic	$ 0.08	$ (0.13)	$ (0.68)	$ (0.90)					$ (1.62)	$ (1.63)	$ (1.05)
Diluted	$ 0.07	$ (0.13)	$ (0.68)	$ (0.90)					$ (1.62)	(1.63)	$ (1.05)
Net loss per share:
Basic and Diluted					$ (0.51)	$ (0.43)	$ (0.46)	$ (0.22)		$ (1.63)
Shares used in the calculation of net (loss) income per share:
Basic	88,665	88,325	88,063	87,283					88,089	86,713	84,496
Diluted	92,659	88,325	88,063	87,283					88,089	86,713	84,496
Shares used in the calculation of net loss per share:
Basic and Diluted					86,874	86,784	86,694	86,497		86,713

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