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Product Warranties (Tables)
3 Months Ended
Mar. 31, 2017
Guarantees [Abstract]  
Product Warranty Activity

Product warranty activity for the three months ended March 31 was as follows (in thousands):

 

     Three Months Ended  
     March 31,  
     2017      2016  

Balance at the beginning of the period

   $ 214      $ 584  

Accruals for warranties for products sold in the period

     104        122  

Fulfillment of warranty obligations

     (73      (68

Revisions of estimated obligations

     (60      (50
  

 

 

    

 

 

 

Balance at the end of the period

   $ 185      $ 588