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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Corporate federal income tax | 21.00% | 21.00% | 24.30% | 35.00%
Deferred tax asset, income tax expense (benefit) | $ 600 |  |  |
Deemed repatriation tax | 800 |  |  |
Undistributed Earnings of Foreign Subsidiaries | 11,000 |  | $ 12,700 |
U.S. |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 241 |  |  |
Operating Loss Carryforwards | 2,000 |  | 1,000 |
State |  |  |  |
Valuation Allowance, Deferred Tax Asset, Change in Amount | 241 |  |  |
Operating Loss Carryforwards | 4,800 |  | $ 2,000 |
Tax Credit Carryforwards | 55 |  |  |
U.K. |  |  |  |
Operating Loss Carryforwards | $ 8,200 |  |  |

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- Definition Amount of income tax expense (benefit) for remeasurement of deferred tax asset from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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