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Credit Risk (Details) - Accounts Receivable [Member] - Credit Concentration Risk [Member] | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2016
Ford And Affiliates [Member] |  |
Concentration Risk [Line Items] |  |
Entity-wide revenue, major customer, percentage | 29.00% | 28.00%
Mazda [Member] |  |
Concentration Risk [Line Items] |  |
Entity-wide revenue, major customer, percentage | 17.00% | 17.00%
Nissan\Renault [Member] |  |
Concentration Risk [Line Items] |  |
Entity-wide revenue, major customer, percentage | 13.00% | 14.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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