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Product Warranties (Tables)
9 Months Ended
Sep. 30, 2018
Guarantees and Product Warranties [Abstract]  
Product Warranty Activity

Product warranty activity was as follows (in thousands):

 

     Three Months Ended
September 30,
     Nine Months Ended
September 30,
 
     2018      2017      2018      2017  

Balance at the beginning of the period

   $ 326    $ 244    $ 290    $ 214

Accruals for warranties for products sold in the period

     6      126      139      321

Fulfillment of warranty obligations

     (17      (82      (94      (179

Revisions of estimated obligations

     (58      —          (78      (68
  

 

 

    

 

 

    

 

 

    

 

 

 

Balance at the end of the period

   $ 257    $ 288    $ 257    $ 288