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

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

 

     Three Months Ended      Nine Months Ended  
     September 30,      September 30,  
     2016      2015      2016      2015  

Balance at the beginning of the period

   $ 496      $ 332      $ 584      $ 204  

Accruals for warranties for products sold in the period

     61         280        291        465  

Fulfillment of warranty obligations

     (106      (18      (374      (75

Revisions of estimated obligations

     (109      —           (159 )      —     
  

 

 

    

 

 

    

 

 

    

 

 

 

Balance at the end of the period

   $ 342      $ 594      $ 342      $ 594