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Acquisition - Narrative (Details) - 3M's Drive-Thru Communications Systems $ in Thousands | Sep. 30, 2019 USD ($)
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Business Acquisition [Line Items] |
Business acquisition, purchase price | $ 8,400
Fair value of assets acquired | 8,412
Warranty liability assumed | 1,412
Business acquisition, cash paid | 7,000
Warranty liability assumed, short-term | 712
Warranty liability assumed, long-term | $ 700

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