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Income Taxes - Summary of provision for income taxes from continuing operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Current income tax: |  |
Federal | $ 0 | $ 61
State | 122 | 167
Foreign | 227 | 211
Total current | 349 | 439
Deferred income tax: |  |
Federal | 4,029 | 768
State | (381) | (60)
Total deferred | 3,648 | 708
Provision for income taxes | $ 3,997 | $ 1,147

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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