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Headquarter Relocation	12 Months Ended
Headquarter Relocation	Dec. 31, 2017
Restructuring and Business Realignment [Abstract]
Headquarter Relocation	11. Headquarter Relocation and Consolidation During the fourth quarter of 2016, the Company relocated its corporate headquarters from Warren, Ohio to Novi, Michigan and consolidated its other corporate functions into one location. As a result, the Company incurred relocation costs recorded within SG&A expense, which included employee retention, relocation, severance, recruiting, duplicate wages and professional fees, of $493 and $1,769 for the years ended December 31, 2017 and 2016, respectively. In connection with the headquarter relocation, the Company was approved for a Michigan Business Development Program grant of up to $1,400 based upon the number of new jobs created in Michigan through 2022. As a result of the attainment of the first milestone, grant income of $338 was recognized during the year ended December 31, 2017 within SG&A expense in the consolidated statements of operations.