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Product Warranty (Tables)
 9 Months Ended
Sep. 30, 2016
Product Warranties Disclosures [Abstract]  
Schedule of activity related to the product warranty liability
The following table summarizes the activity related to the product warranty liability during the nine months ended September 30, 2016 (in thousands):
Balance at beginning of the period
 
$
593

Cost of warranty claims
 
(73
)
Accruals for product warranties
 
29

Balance at end of the period
 
$
549