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Product Warranty (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2016 (in thousands):
Balance at beginning of the period
 
$
593

(Reversed) to expense
 
(52
)
Accruals for product warranties
 
(17
)
Balance at end of the period
 
$
524