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Major Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Product and Service [Domain]
Revenue, Major Customer [Line Items]
Revenues	$ 72,266,000	$ 63,046,000
Product and Service [Domain] | Navistar [Member]
Revenue, Major Customer [Line Items]
Revenues	14,292,000	10,951,000
Product and Service [Domain] | Volvo [Member]
Revenue, Major Customer [Line Items]
Revenues	14,622,000	10,197,000
Product and Service [Domain] | Paccar [Member]
Revenue, Major Customer [Line Items]
Revenues	11,985,000	9,966,000
Product and Service [Domain] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenues	31,367,000	31,932,000
Product [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	71,451,000	59,712,000
Product [Member] | Navistar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	14,253,000	10,951,000
Product [Member] | Volvo [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	14,515,000	10,197,000
Product [Member] | Paccar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	11,812,000	6,763,000
Product [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	30,871,000	31,801,000
Service [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	815,000	3,334,000
Service [Member] | Navistar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	39,000	0
Service [Member] | Volvo [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	107,000	0
Service [Member] | Paccar [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	173,000	3,203,000
Service [Member] | Other Customers [Member]
Revenue, Major Customer [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 496,000	$ 131,000

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