Summary of Significant Accounting Policies - Schedule of Net Sales to Significant Customers as Percentage of Total Net Sales (Details) - Revenue Benchmark	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cummins Inc.
Concentration Risk [Line Items]
Concentration of risk, percentage	13.10%	16.10%	15.20%
Honda Motor Co.
Concentration Risk [Line Items]
Concentration of risk, percentage	8.00%	9.60%	10.50%
Toyota Motor Corporation
Concentration Risk [Line Items]
Concentration of risk, percentage	13.40%	11.60%	10.50%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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