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Income Taxes - Components of Loss before Income Taxes and Dividends on Preferred Stock (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Components of income (loss) before income taxes |  |
United States | $ (2,990) | $ (3,556)
Foreign | 1,620 | 404
Discontinued operations | (896) | (2,031)
Income (loss) before income taxes | $ (2,266) | $ (5,183)

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