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Liability for Warranty Returns (Tables)
 9 Months Ended
Sep. 30, 2023
Product Warranties Disclosures [Abstract]  
Summary of Warranty Expense and Write-off Activity The warranty expense and write-off activity for the three and nine months ended September 30, 2023 and 2022 are summarized as follows:

 

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

 

September 30,

 

 

September 30,

 

(In thousands)

 

2023

 

 

2022

 

 

2023

 

 

2022

 

Balance at beginning of period

 

$

6,831

 

 

$

4,842

 

 

$

7,196

 

 

$

5,403

 

Plus: Adtran Networks acquisition

 

 

—

 

 

 

3,756

 

 

 

—

 

 

 

3,756

 

Plus: Amounts charged to cost and expenses

 

 

752

 

 

 

616

 

 

 

2,289

 

 

 

1,727

 

Plus: Foreign currency translation adjustments

 

 

(73

)

 

 

—

 

 

 

(33

)

 

 

—

 

Less: Deductions

 

 

(943

)

 

 

(613

)

 

 

(2,885

)

 

 

(2,285

)

Balance at end of period

 

$

6,567

 

 

$

8,601

 

 

$

6,567

 

 

$

8,601