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Product Warranties (Tables)
6 Months Ended
Jun. 30, 2017
Guarantees and Product Warranties [Abstract]  
Product Warranty Activity

Product warranty activity for the three and six months ended June 30 was as follows (in thousands):

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
     2017      2016      2017      2016  

Balance at the beginning of the period

   $  185    $  587    $  214    $  584

Accruals for warranties for products sold in the period

     91      107        195        229  

Fulfillment of warranty obligations

     (24      (198      (97      (267

Revisions of estimated obligations

     (8      —          (68      (50
  

 

 

    

 

 

    

 

 

    

 

 

 

Balance at the end of the period

   $ 244    $ 496    $ 244    $ 496