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Income Tax - Income tax expense (benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (benefit) Attributable To Income From Continuing Operations [Abstract] |  |  |  |  |  |  |  |  |  |
Federal and state |  |  |  |  |  |  |  |  | $ (191) | $ 253
Foreign, current |  |  |  |  |  |  |  |  | 279 | 297
Current Income Tax Expense (Benefit), Total |  |  |  |  |  |  |  |  | 88 | 550
Federal and state, deferred tax |  |  |  |  |  |  |  |  | (3,552) | (1,730)
Foreign, deferred |  |  |  |  |  |  |  |  | (212) | 575
Deferred Income Taxes |  |  |  |  |  |  |  |  | (3,764) | (1,155)
Income Tax Expense, Total | $ (3,260) | $ (652) | $ (369) | $ 605 | $ (464) | $ (19) | $ (115) | $ (7) | (3,676) | (605)
Income Tax Expense (benefit) Attributable To Income From Continuing and discontinued Operations [Abstract] |  |  |  |  |  |  |  |  |  |
Continuing operations | $ (3,260) | $ (652) | $ (369) | $ 605 | $ (464) | $ (19) | $ (115) | $ (7) | (3,676) | (605)
Discontinued operations |  |  |  |  |  |  |  |  | (441) | (617)
Total income tax benefit |  |  |  |  |  |  |  |  | $ (4,117) | $ (1,222)

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- Definition The component of income tax expense for the period representing amounts paid or payable (or refundable) as determined by applying the provisions of enacted federal, state and local tax law to the relevant amounts of taxable Income or Loss from continuing operations. + References No definition available. + Details
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- Definition The component of total income tax expense for the period comprised of the increase (decrease) during the period in the entity's deferred tax assets and liabilities attributable to continuing operations as determined by applying the provisions of the federal, state and local tax laws. + References No definition available. + Details
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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721525-107759 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32672-109319 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109222160&loc=d3e1012-107759 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109222650&loc=d3e1361-107760 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=109222160&loc=SL51721523-107759 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721675-107760 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721673-107760 + Details
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