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United States and Foreign Components of Consolidated Loss before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
U.S. $ (57,925) $ (63,246) $ (59,897)
Foreign 1,227 515 358
Loss before income taxes $ (56,698) $ (62,731) $ (59,539)