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Income Taxes - Schedule of Income before Income Tax, Domestic and Foreign (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ 19,889 $ 1,471 $ 51,089
Foreign (20,768) (3,419) (4,845)
Income (loss) before provision for income taxes $ (879) $ (1,948) $ 46,244