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Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018 | Jan. 01, 2017
Tax Credit Carryforward [Line Items] |  |  |  |  |
General business credit | $ 9 |  |  |  |
Foreign tax credit carry-forwards | 2,360 | $ 2,958 |  |  |
Cumulative effect adjustment |  |  |  | $ (2,748) |
Non-current deferred income tax asset | 226 | 20 |  | 222 |
Valuation allowance, deferred tax asset | 2,130 |  |  |  |
Interest and penalities | 80 | 67 | $ 40 |  |
Non-current income taxes payable | 447 | 564 | 545 |  |
Reasonably possible change in unrecognized tax benefit | 359 |  |  |  |
Reduction to deferred tax assets and corresponding valuation allowance related to 2017 Tax Act | 484 | 1,780 |  |  |
Reduction to deferred tax assets and corresponding valuation allowance related to 2017 Tax Act | 2,264 |  |  |  |
Transitional toll tax related to 2017 Tax Act | 1,209 |  |  |  |
Net tax benefit related to 2017 Tax Act | 54 |  |  |  |
Net tax benefit related to estimate of the provisions of the 2017 Tax Act |  | 54 |  |  |
Income (loss) before income taxes | (7,667) | (9,938) | (1,970) |  |
Deferred income tax expense (benefit) | (781) | $ (756) | $ 2,406 |  |
Federal | Research Tax Credit Carryforward |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized excess tax benefit | 4,707 |  |  |  |
State Tax Authority |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized excess tax benefit | 251 |  |  |  |
State Tax Authority | Research Tax Credit Carryforward |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Unrecognized excess tax benefit | $ 3,518 |  |  |  |
Accounting Standards Update 2016-09 | Deferred Tax Assets, Tax Credit Carryforwards And Operating Loss Carryforwards |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ 1,117
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |
Non-current deferred income tax asset |  |  |  | $ 202 |

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