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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
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Dec. 31, 2017 | Dec. 31, 2016
Components of income (loss) before income taxes |  |
United States | $ (5,587) | $ (7,545)
Foreign | 404 | 529
Income (loss) before income taxes | $ (5,183) | $ (7,016)

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- Definition Income Loss Before Income Taxes and Preferred Dividend Foreign + References No definition available. + Details
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