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Product Warranties (Tables)
6 Months Ended
Jun. 30, 2016
Guarantees [Abstract]  
Product Warranty Activity

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

 

     Three Months Ended      Six Months Ended  
     June 30,      June 30,  
     2016      2015      2016      2015  

Balance at the beginning of the period

   $ 587      $ 187      $ 584      $ 204  

Accruals for warranties for products sold in the period

     107        170        229         185  

Fulfillment of warranty obligations

     (198      (25      (267      (57

Revisions of estimated obligations

     —           —           (50      —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Balance at the end of the period

   $ 496      $ 332      $ 496      $ 332