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Accrued Warranty Reserve
 12 Months Ended
Dec. 31, 2019
Guarantees and Product Warranties [Abstract]  
Accrued Warranty Reserve
7.

Accrued Warranty Reserve

The following table summarizes the activity related to the estimated accrued warranty reserve during the years ended December 31, (in thousands):

 

     2018      2019  

Beginning balance

    $ 2,916      $ 1,935  

Provision for warranties issued

      759        2,473  

Payments

      (886 )       (730 ) 

Warranty expirations

      (854 )       (1,086 ) 
  

 

 

     

 

 

  

Ending balance

    $ 1,935      $ 2,592