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Income Tax - (Narratives) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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 [Abstract] |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate |  |  |  |  |  |  |  |  | 46.10% | 23.10%
Income tax expense (benefit) | $ (3,260) | $ (652) | $ (369) | $ 605 | $ (464) | $ (19) | $ (115) | $ (7) | $ (3,676) | $ (605)
US Federal Income Tax Rate |  |  |  |  |  |  |  |  |  | 35.00%
US Federal Income Tax Rate, based on Tax Cuts And Jobs Act Of 2017 |  |  |  |  |  |  |  |  | 21.00% |
Tax provision for the impact of the remeasurement of deferred tax assets and liabilities |  |  |  |  |  |  |  |  |  | $ 3,200
Increase (Decrease) In Income Taxes Resulting From Release Of Uncertain Tax Position Liability Due To Expiration Of Statute Of Limitations |  |  |  |  |  |  |  |  | $ 94 |
Transition tax on the mandatory deemed repatriation of foreign earnings |  |  |  |  |  |  |  |  |  | 3,000
Discontinued Operation, Tax Effect of Discontinued Operation |  |  |  |  |  |  |  |  | (441) | (617)
Deferred Tax Assets, Valuation Allowance | 13,899 |  |  |  | 11,447 |  |  |  | 13,899 | 11,447
Cash In Foreign Subsidiaries | 3,200 |  |  |  | 4,800 |  |  |  | 3,200 | 4,800
Tax Liability On Foreign Earnings Repatriated | 38 |  |  |  | 38 |  |  |  | 38 | 38
German income tax audit was settled |  |  |  |  |  |  |  |  |  | 30
Unrecognized Tax Benefits, Increase Resulting from Audits |  |  |  |  |  |  |  |  | 200 |
Additions based on tax positions of acquired entities |  |  |  |  |  |  |  |  | 1,389 |
Unrecognized Tax Benefits, Increase Resulting from Credits |  |  |  |  |  |  |  |  | 800 |
Unrecognized Tax Benefits, Increase Resulting from State Income Tax Issues |  |  |  |  |  |  |  |  | 500 |
Unrecognized Tax Benefits, Decrease Resulting from Acquisition |  |  |  |  |  |  |  |  | 500 |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net | 10,373 |  |  |  | 2,037 |  |  |  | 10,373 | 2,037
Research and development tax credit carryforwards offset by reserve for uncertain tax positions | 1,000 |  |  |  |  |  |  |  | 1,000 |
Alternative minimum tax credit carryforwards | 800 |  |  |  |  |  |  |  | 800 |
State investment tax credit carryforwards, research and development tax credit carryforwards, and EZ credit carryforwards | 3,800 |  |  |  |  |  |  |  | 3,800 |
Accrued Penalties and Interest, Income Tax | 100 |  |  |  | 15 |  |  |  | 100 | 15
Penalties and Interest Expense |  |  |  |  |  |  |  |  | 31 | 5
Expire in 2020 [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Research and development tax carryforward | 8,600 |  |  |  |  |  |  |  | 8,600 |
Foreign tax credits carryforward | 200 |  |  |  |  |  |  |  | 200 |
ASU 2016-09 |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net |  |  |  |  | $ 500 |  |  |  |  | $ 500
Federal |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards | 27,200 |  |  |  |  |  |  |  | 27,200 |
Federal | Expire between 2019 and 2037 [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards | 21,900 |  |  |  |  |  |  |  | 21,900 |
State | Expire between 2019 and 2037 [Member] |  |  |  |  |  |  |  |  |  |
Income Tax Disclosure |  |  |  |  |  |  |  |  |  |
Operating loss carryforwards | $ 17,500 |  |  |  |  |  |  |  | $ 17,500 |

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