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Restructuring Restructuring Plan (Details Textual) - 2016 Restructuring Plan
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
employee
Number of Positions Eliminated (in employee) | employee   7
Costs Incurred | $ $ 0 $ 286