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Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2016 | Jun. 30, 2012 | Dec. 31, 2012 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Concentration of Credit Risk and Single Source Suppliers |  |  |  |  |  |
Marketable securities | $ 25,712 |  |  | $ 25,712 | $ 22,619 |
Advertising Costs |  |  |  |  |  |
Advertising expense |  |  |  | 2,761 | 2,712 | $ 2,825
Foreign Currency Translation |  |  |  |  |  |
Foreign currency transaction gain (loss), before tax |  |  |  | 53 | $ 59 | 126
Gain on Settlement of Royalty Payments | $ 855 |  |  |  |  |
Net sales to SANG |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contract amount |  | $ 35,600 |  |  |  |
Contracts revenue |  |  |  |  |  | $ 1,300
Net sales to SANG | Defense Products |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contract amount |  |  | $ 21,200 |  |  |
Net sales to SANG | Sevices |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Contract amount |  |  | $ 14,400 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  | $ 1,571 |  |

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