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Income Taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
Tax Credit Carryforward [Line Items] |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business | $ 9 |  |  |
Foreign tax credit carry-forwards | 2,958 | $ 754 |  |
Income (loss) before income taxes | (9,938) | (1,970) | $ 2,666 |
Valuation allowance, deferred tax asset, change in amount | 4,447 |  |  |
Valuation allowance, amount | 16,014 | 11,567 |  |
Change in valuation allowance | 3,330 | 7,425 | 1,392 |
Federal |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income (loss) before income taxes | (13,271) | (7,775) | (570) |
Federal | Research Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforward, amount | 4,329 |  |  |
State Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforward, amount | 243 |  |  |
Change in valuation allowance | 3,330 |  |  |
State Tax Authority | Research Tax Credit Carryforward |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax credit carryforward, amount | 3,501 |  |  |
Foreign Tax Authority |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income (loss) before income taxes | $ 3,333 | $ 5,805 | $ 3,236 |
Accounting Standards Update 2016-09 [Member] | Deferred Tax Assets, Tax Credit Carryforwards And Operating Loss Carryforwards [Member] |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  | $ 1,117

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