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

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

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2017      2016      2017      2016  

Balance at the beginning of the period

   $ 244      $ 496      $ 214      $ 584  

Accruals for warranties for products sold in the period

     126      61      321      291

Fulfillment of warranty obligations

     (82      (106      (179      (374

Revisions of estimated obligations

     —          (109      (68      (159
  

 

 

    

 

 

    

 

 

    

 

 

 

Balance at the end of the period

   $ 288      $ 342      $ 288      $ 342