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Loss from Continuing Operations Before Provision for Income Tax (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
United States $ (51,044) $ (84,207)
Foreign (859) (2,528)
Loss before income tax expense $ (51,903) $ (86,735)