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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Concentration of Credit Risk and Single Source Suppliers |  |  |  |  |
Marketable securities | $ 25,712 |  | $ 8,319 | $ 25,712 |
Advertising Costs |  |  |  |  |
Advertising expense |  |  | 2,739 | 2,761 | $ 2,712
Foreign Currency Translation |  |  |  |  |
Foreign currency transaction gain (loss), before tax |  |  | (554) | $ (53) | $ 59
Gain on Settlement of Royalty Payments | $ 855 |  |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  | $ 1,571 |  |
Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Minimum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
new accounting pronouncement effect of adoption on previously stated amounts in prior periods |  | $ 12,000 |  |  |
Revenue from Contract with Customer [Member] | Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Maximum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 14,000 |  |  |
Accumulated Earnings | Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Minimum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | 3,000 |  |  |
Accumulated Earnings | Scenario, Forecast [Member] | Accounting Standards Update 2014-09 [Member] | Maximum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 4,000 |  |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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