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Income Taxes - Components of Income (Loss) from Continuing Operations Before Income Tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
United States $ (16,848) $ 9,620 $ (4,246)
(Loss) income from continuing operations before income taxes $ (16,848) $ 9,620 $ (4,246)