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Income Taxes - Components of Loss Before Income Taxes from Continuing Operations (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Domestic $ (52,438) $ (65,356)
Foreign (857) (6,124)
Total $ (53,295) $ (71,480)