Annual report pursuant to Section 13 and 15(d)

Income Taxes - Summary of Components of Income (Loss) Before Income Taxes (Detail)

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Income Taxes - Summary of Components of Income (Loss) Before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
United States $ (145,954) $ (89,233) $ (131,106)
Foreign (11,947) (20,428) (25,538)
Income (loss) before income taxes $ (157,901) $ (109,661) $ (156,644)