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Income Taxes - Components of Income (Loss) before Income Taxes and Dividends on Preferred Stock (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Components of income (loss) before income taxes    
United States $ (7,545) $ (2,906)
Foreign 529 741
Income (loss) before income taxes $ (7,016) $ (2,165)