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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

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