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Income Taxes - Income (Loss) From Continuing Operations Before Income Tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income (Loss) from Operations before Income Tax Expense (Benefit) [Abstract] |  |  |
Income (loss) before income taxes | $ (9,938) | $ (1,970) | $ 2,666
United States |  |  |
Income (Loss) from Operations before Income Tax Expense (Benefit) [Abstract] |  |  |
Income (loss) before income taxes | (13,271) | (7,775) | (570)
Foreign Tax Authority |  |  |
Income (Loss) from Operations before Income Tax Expense (Benefit) [Abstract] |  |  |
Income (loss) before income taxes | $ 3,333 | $ 5,805 | $ 3,236

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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