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Product Warranty (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 (in thousands):
Balance at beginning of the period
 
$
587

Reversed to income
 
(33
)
Cost of warranty claims
 
(2
)
Balance at end of the period
 
$
552