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Summary of Significant Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2018 USD ($) $ / shares shares | Mar. 31, 2018 hub | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Gain on settlement of royalty payments |  |  | $ 855 |  |  |  |
Sale of treasury stock (in shares) | shares | 377,000 |  |  |  |  |  |
Purchase price (in USD per share) | $ / shares | $ 11.95 |  |  |  |  |  |
Sale of treasury stock | $ 4,500 |  |  | $ 4,500 | $ 0 | $ 0 |
Capital lease term |  | 5 years |  |  |  |  |
Satellite hubs leased | hub |  | 3 |  |  |  |  |
Concentration of Credit Risk and Single Source Suppliers |  |  |  |  |  |  |
Marketable securities |  |  |  | 25 | 8,319 |  |
Advertising Costs |  |  |  |  |  |  |
Advertising expense |  |  |  | 1,954 | 2,739 | 2,761 |
Foreign Currency Translation |  |  |  |  |  |  |
Foreign currency transaction gain, before tax |  |  |  | $ 497 | $ 554 | $ (53) |
Minimum |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Sales-type lease period |  |  |  | 3 years |  |  |
Sales-type lease interest rate |  |  |  | 5.00% |  |  |
Maximum |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Sales-type lease period |  |  |  | 5 years |  |  |
Sales-type lease interest rate |  |  |  | 8.50% |  |  |
Revenue-generating assets |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Property, plant and equipment, useful lives |  |  |  | P5Y |  |  |
Accounting Standards Update 2016-02 | Minimum |  |  |  |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |
Right-to-use assets |  |  |  |  |  |  | $ 12,000
Lease liabilities |  |  |  |  |  |  | 12,000
Accounting Standards Update 2016-02 | Maximum |  |  |  |  |  |  |
Foreign Currency Translation |  |  |  |  |  |  |
Right-to-use assets |  |  |  |  |  |  | 15,000
Lease liabilities |  |  |  |  |  |  | $ 15,000

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