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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] | The following presents a roll-forward of the Company’s unrecognized tax benefits and associated interest for the six months ended June 30, 2018 (in thousands):
|  | Unrecognized tax |
|  | benefits |
Balance - January 1, 2018 |  | $ | 911 |
Interest accrual |  |  | 9 |
Foreign currency revaluation |  |  | (50 | )
Balance - June 30, 2018 |  | $ | 870 |

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