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Acquired Intangible Assets, Acquired Assets and Liabilities and Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Amortization of acquired intangible assets [Abstract]
Amortization expense	$ 2,100	$ 2,000
Estimated amortization expense, remainder of 2021	4,800
Estimated amortization expense in year 2022	5,300
Estimated amortization expense in year 2023	5,000
Estimated amortization expense in year 2024	5,000
Estimated amortization expense in years 2025 through 2034	29,400
Particulate Matter Sensor Business of Stoneridge, Inc. [Member]
Intangible assets acquired [Abstract]
Intangible assets	755
Customer Relationships [Member] | Particulate Matter Sensor Business of Stoneridge, Inc. [Member]
Intangible assets acquired [Abstract]
Intangible assets	$ 800
Estimated useful life of intangible assets	10 years
Trademarks and Trade Names [Member]
Intangible assets acquired [Abstract]
Amount of acquired indefinite-lived intangible assets	$ 2,600

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Aggregate amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fourth fiscal year following the current fiscal year.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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