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Employee Savings 401(K) Plan	12 Months Ended
Employee Savings 401(K) Plan	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Savings 401(K) Plan	EMPLOYEE SAVINGS 401(k) PLAN ATRM has a 401(k) employee savings plan, which covers full-time ATRM employees who are at least 21 years of age. Contributions to the savings plan are at the discretion of management. No contributions were made to the plan in fiscal years 2017 or 2016.