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3.         Credit Losses

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Effective January 1, 2020, the Company adopted new accounting guidance that significantly changed the impairment model for estimating credit losses on financial assets to a current expected credit losses (“CECL”) model that requires entities to estimate the lifetime expected credit losses on such assets, leading to earlier recognition of such losses. Effective January 1, 2020, the adoption of CECL accounting, through a modified-retrospective approach, caused an increase to the allowance for credit losses of approximately $400 and $350 for the Work Truck Attachments and Work Truck Solutions segments, respectively.

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The majority of the Company’s accounts receivable are due from distributors of truck equipment and dealers of completed upfit trucks. Credit is extended based on an evaluation of a customer’s financial condition. A

receivable is considered past due if payments have not been received within agreed upon invoice terms. Accounts receivable are written off after all collection efforts have been exhausted. The Company takes a security interest in the inventory as collateral for the receivable but often does not have a priority security interest. The Company has short-term accounts receivable at its Work Truck Attachments and Work Truck Solutions segments subject to evaluation for expected credit losses. Expected credit losses are estimated based on the loss-rate and probability of default methods. On a periodic basis, the Company evaluates its accounts receivable and establishes the allowance for credit losses based on specific customer circumstances, past events including collections and write-off history, current conditions, and reasonable forecasts about the future. As of September 30, 2021, the Company had an allowance for credit losses on its trade accounts receivable of $1,783 and $1,674 at its Work Truck Attachments and Work Truck Solutions segments, respectively. As of December 31, 2020, the Company had an allowance for credit losses on its trade accounts receivable of $1,480 and $1,449 at its Work Truck Attachments and Work Truck Solutions segments, respectively.

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The following table rolls forward the activity related to credit losses for trade accounts receivable at each segment, and on a consolidated basis for the nine months ended September 30, 2021 and 2020:

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