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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, 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

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- Definition

Income loss before income taxes and preferred dividend.

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- Definition

Income Loss Before Income Taxes and Preferred Dividend Domestic

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- Definition

Income Loss Before Income Taxes and Preferred Dividend Foreign

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