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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, 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
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 131,492 $ 151,757 $ 96,905 $ 71,086 $ 94,517 $ 60,774 $ 6,335 $ 0 $ 451,240 $ 161,626 $ 15,000
Operating expenses 109,621 97,434 98,757 108,533 82,683 66,769 63,603 79,932 414,345 292,987 162,372
Net (loss) income $ 18,078 $ 50,764 $ (5,913) $ (41,818) $ 6,894 $ (11,125) $ (59,985) $ (78,326) $ 21,111 $ (142,542) $ (141,090)
Net (loss) income per share:                      
Basic $ 0.20 $ 0.56 $ (0.07) $ (0.47) $ 0.08 $ (0.13) $ (0.68) $ (0.90) $ 0.23 $ (1.62) $ (1.63)
Diluted $ 0.19 $ 0.52 $ (0.07) $ (0.47) $ 0.07 $ (0.13) $ (0.68) $ (0.90) $ 0.22 $ (1.62) $ (1.63)
Shares used in the calculation of net income (loss) per share:                      
Basic 90,742 90,555 90,100 89,526 88,665 88,325 88,063 87,283 90,235 88,089 86,713
Diluted 95,724 96,798 90,100 89,526 92,659 88,325 88,063 87,283 95,386 88,089 86,713